Migrates users of QuicheMemSlice to the new code location.

Tested:
    TAP --sample ran all affected tests and none failed
    http://test/OCL:758795368:BASE:758755908:1747253870724:71b279ac

Protected by refactoring, no functional change; not protected.

PiperOrigin-RevId: 759139110
diff --git a/quiche/quic/moqt/moqt_cached_object.cc b/quiche/quic/moqt/moqt_cached_object.cc
index 9aef3e0..33294bb 100644
--- a/quiche/quic/moqt/moqt_cached_object.cc
+++ b/quiche/quic/moqt/moqt_cached_object.cc
@@ -6,7 +6,7 @@
 
 #include "absl/strings/string_view.h"
 #include "quiche/quic/moqt/moqt_publisher.h"
-#include "quiche/common/platform/api/quiche_mem_slice.h"
+#include "quiche/common/quiche_mem_slice.h"
 
 namespace moqt {
 
diff --git a/quiche/quic/moqt/moqt_cached_object.h b/quiche/quic/moqt/moqt_cached_object.h
index 78807bc..ac33096 100644
--- a/quiche/quic/moqt/moqt_cached_object.h
+++ b/quiche/quic/moqt/moqt_cached_object.h
@@ -11,7 +11,7 @@
 #include "quiche/quic/moqt/moqt_messages.h"
 #include "quiche/quic/moqt/moqt_priority.h"
 #include "quiche/quic/moqt/moqt_publisher.h"
-#include "quiche/common/platform/api/quiche_mem_slice.h"
+#include "quiche/common/quiche_mem_slice.h"
 
 namespace moqt {
 
diff --git a/quiche/quic/moqt/moqt_live_relay_queue.cc b/quiche/quic/moqt/moqt_live_relay_queue.cc
index c50caa5..e6b6f9b 100644
--- a/quiche/quic/moqt/moqt_live_relay_queue.cc
+++ b/quiche/quic/moqt/moqt_live_relay_queue.cc
@@ -17,8 +17,8 @@
 #include "quiche/quic/moqt/moqt_publisher.h"
 #include "quiche/quic/moqt/moqt_subscribe_windows.h"
 #include "quiche/common/platform/api/quiche_logging.h"
-#include "quiche/common/platform/api/quiche_mem_slice.h"
 #include "quiche/common/quiche_buffer_allocator.h"
+#include "quiche/common/quiche_mem_slice.h"
 #include "quiche/common/simple_buffer_allocator.h"
 #include "quiche/web_transport/web_transport.h"
 
diff --git a/quiche/quic/moqt/moqt_outgoing_queue.cc b/quiche/quic/moqt/moqt_outgoing_queue.cc
index 1c24cde..0428f7e 100644
--- a/quiche/quic/moqt/moqt_outgoing_queue.cc
+++ b/quiche/quic/moqt/moqt_outgoing_queue.cc
@@ -22,7 +22,7 @@
 #include "quiche/quic/moqt/moqt_publisher.h"
 #include "quiche/quic/moqt/moqt_subscribe_windows.h"
 #include "quiche/common/platform/api/quiche_bug_tracker.h"
-#include "quiche/common/platform/api/quiche_mem_slice.h"
+#include "quiche/common/quiche_mem_slice.h"
 
 namespace moqt {
 
diff --git a/quiche/quic/moqt/moqt_outgoing_queue.h b/quiche/quic/moqt/moqt_outgoing_queue.h
index d20f900..c6302fb 100644
--- a/quiche/quic/moqt/moqt_outgoing_queue.h
+++ b/quiche/quic/moqt/moqt_outgoing_queue.h
@@ -22,8 +22,8 @@
 #include "quiche/quic/moqt/moqt_messages.h"
 #include "quiche/quic/moqt/moqt_priority.h"
 #include "quiche/quic/moqt/moqt_publisher.h"
-#include "quiche/common/platform/api/quiche_mem_slice.h"
 #include "quiche/common/quiche_circular_deque.h"
+#include "quiche/common/quiche_mem_slice.h"
 
 namespace moqt {
 
diff --git a/quiche/quic/moqt/moqt_publisher.h b/quiche/quic/moqt/moqt_publisher.h
index 1123d93..9d8950c 100644
--- a/quiche/quic/moqt/moqt_publisher.h
+++ b/quiche/quic/moqt/moqt_publisher.h
@@ -16,8 +16,8 @@
 #include "quiche/quic/core/quic_time.h"
 #include "quiche/quic/moqt/moqt_messages.h"
 #include "quiche/quic/moqt/moqt_priority.h"
-#include "quiche/common/platform/api/quiche_mem_slice.h"
 #include "quiche/common/quiche_callbacks.h"
+#include "quiche/common/quiche_mem_slice.h"
 #include "quiche/web_transport/web_transport.h"
 
 namespace moqt {
diff --git a/quiche/quic/moqt/moqt_session.cc b/quiche/quic/moqt/moqt_session.cc
index 3b6be52..1e91479 100644
--- a/quiche/quic/moqt/moqt_session.cc
+++ b/quiche/quic/moqt/moqt_session.cc
@@ -42,8 +42,8 @@
 #include "quiche/quic/platform/api/quic_logging.h"
 #include "quiche/common/platform/api/quiche_bug_tracker.h"
 #include "quiche/common/platform/api/quiche_logging.h"
-#include "quiche/common/platform/api/quiche_mem_slice.h"
 #include "quiche/common/quiche_buffer_allocator.h"
+#include "quiche/common/quiche_mem_slice.h"
 #include "quiche/common/quiche_stream.h"
 #include "quiche/common/simple_buffer_allocator.h"
 #include "quiche/web_transport/web_transport.h"
diff --git a/quiche/quic/moqt/moqt_session_test.cc b/quiche/quic/moqt/moqt_session_test.cc
index f92dead..8b4814b 100644
--- a/quiche/quic/moqt/moqt_session_test.cc
+++ b/quiche/quic/moqt/moqt_session_test.cc
@@ -33,8 +33,8 @@
 #include "quiche/quic/moqt/tools/moqt_mock_visitor.h"
 #include "quiche/quic/platform/api/quic_test.h"
 #include "quiche/quic/test_tools/quic_test_utils.h"
-#include "quiche/common/platform/api/quiche_mem_slice.h"
 #include "quiche/common/quiche_buffer_allocator.h"
+#include "quiche/common/quiche_mem_slice.h"
 #include "quiche/common/quiche_stream.h"
 #include "quiche/common/simple_buffer_allocator.h"
 #include "quiche/web_transport/test_tools/in_memory_stream.h"
diff --git a/quiche/quic/moqt/moqt_track.cc b/quiche/quic/moqt/moqt_track.cc
index ed2c002..b62f5b4 100644
--- a/quiche/quic/moqt/moqt_track.cc
+++ b/quiche/quic/moqt/moqt_track.cc
@@ -19,8 +19,8 @@
 #include "quiche/quic/moqt/moqt_messages.h"
 #include "quiche/quic/moqt/moqt_publisher.h"
 #include "quiche/common/platform/api/quiche_bug_tracker.h"
-#include "quiche/common/platform/api/quiche_mem_slice.h"
 #include "quiche/common/quiche_buffer_allocator.h"
+#include "quiche/common/quiche_mem_slice.h"
 #include "quiche/common/simple_buffer_allocator.h"
 #include "quiche/web_transport/web_transport.h"
 
diff --git a/quiche/quic/moqt/moqt_track_test.cc b/quiche/quic/moqt/moqt_track_test.cc
index bc6398d..58f1282 100644
--- a/quiche/quic/moqt/moqt_track_test.cc
+++ b/quiche/quic/moqt/moqt_track_test.cc
@@ -19,7 +19,7 @@
 #include "quiche/quic/moqt/tools/moqt_mock_visitor.h"
 #include "quiche/quic/platform/api/quic_test.h"
 #include "quiche/quic/test_tools/quic_test_utils.h"
-#include "quiche/common/platform/api/quiche_mem_slice.h"
+#include "quiche/common/quiche_mem_slice.h"
 
 namespace moqt {