Removes the old quiche_mem_slice_lib BUILD target and forwarding header file.

Protected by removes unused code; not protected.

PiperOrigin-RevId: 761202013

build/source_list.bzl

diff --git a/build/source_list.bzl b/build/source_list.bzl
index e61db38..d6a55f4 100644
--- a/build/source_list.bzl
+++ b/build/source_list.bzl
@@ -31,7 +31,6 @@
     "common/platform/api/quiche_iovec.h",
     "common/platform/api/quiche_logging.h",
     "common/platform/api/quiche_lower_case_string.h",
-    "common/platform/api/quiche_mem_slice.h",
     "common/platform/api/quiche_reference_counted.h",
     "common/platform/api/quiche_server_stats.h",
     "common/platform/api/quiche_stack_trace.h",

build/source_list.gni

diff --git a/build/source_list.gni b/build/source_list.gni
index 2fee7ac..e0371a5 100644
--- a/build/source_list.gni
+++ b/build/source_list.gni
@@ -31,7 +31,6 @@
     "src/quiche/common/platform/api/quiche_iovec.h",
     "src/quiche/common/platform/api/quiche_logging.h",
     "src/quiche/common/platform/api/quiche_lower_case_string.h",
-    "src/quiche/common/platform/api/quiche_mem_slice.h",
     "src/quiche/common/platform/api/quiche_reference_counted.h",
     "src/quiche/common/platform/api/quiche_server_stats.h",
     "src/quiche/common/platform/api/quiche_stack_trace.h",

build/source_list.json

diff --git a/build/source_list.json b/build/source_list.json
index d51f52c..947bbf7 100644
--- a/build/source_list.json
+++ b/build/source_list.json
@@ -30,7 +30,6 @@
     "quiche/common/platform/api/quiche_iovec.h",
     "quiche/common/platform/api/quiche_logging.h",
     "quiche/common/platform/api/quiche_lower_case_string.h",
-    "quiche/common/platform/api/quiche_mem_slice.h",
     "quiche/common/platform/api/quiche_reference_counted.h",
     "quiche/common/platform/api/quiche_server_stats.h",
     "quiche/common/platform/api/quiche_stack_trace.h",

quiche/common/platform/api/quiche_mem_slice.h

diff --git a/quiche/common/platform/api/quiche_mem_slice.h b/quiche/common/platform/api/quiche_mem_slice.h
deleted file mode 100644
index e08c738..0000000
--- a/quiche/common/platform/api/quiche_mem_slice.h
+++ /dev/null
@@ -1,6 +0,0 @@
-#ifndef QUICHE_COMMON_PLATFORM_API_QUICHE_MEM_SLICE_H_
-#define QUICHE_COMMON_PLATFORM_API_QUICHE_MEM_SLICE_H_
-
-#include "quiche/common/quiche_mem_slice.h"
-
-#endif  // QUICHE_COMMON_PLATFORM_API_QUICHE_MEM_SLICE_H_