Update types in `HpackEntryCollector::ValidateIndexedHeader` to `uint64_t`.

To build quiche in chrome.

PiperOrigin-RevId: 797299618

quiche/http2/test_tools/hpack_entry_collector.cc

diff --git a/quiche/http2/test_tools/hpack_entry_collector.cc b/quiche/http2/test_tools/hpack_entry_collector.cc
index 3a3d1b5..8507195 100644
--- a/quiche/http2/test_tools/hpack_entry_collector.cc
+++ b/quiche/http2/test_tools/hpack_entry_collector.cc
@@ -152,11 +152,11 @@
   }
 }
 AssertionResult HpackEntryCollector::ValidateIndexedHeader(
-    size_t expected_index) const {
+    uint64_t expected_index) const {
   HTTP2_VERIFY_TRUE(started_);
   HTTP2_VERIFY_TRUE(ended_);
   HTTP2_VERIFY_EQ(HpackEntryType::kIndexedHeader, header_type_);
-  HTTP2_VERIFY_EQ(expected_index, index_);
+  HTTP2_VERIFY_EQ(expected_index, static_cast<uint64_t>(index_));
   return ::testing::AssertionSuccess();
 }
 AssertionResult HpackEntryCollector::ValidateLiteralValueHeader(

quiche/http2/test_tools/hpack_entry_collector.h

diff --git a/quiche/http2/test_tools/hpack_entry_collector.h b/quiche/http2/test_tools/hpack_entry_collector.h
index 93ad860..35db7ae 100644
--- a/quiche/http2/test_tools/hpack_entry_collector.h
+++ b/quiche/http2/test_tools/hpack_entry_collector.h
@@ -73,7 +73,8 @@
 
   // Returns success if collected an Indexed Header (i.e. OnIndexedHeader was
   // called).
-  ::testing::AssertionResult ValidateIndexedHeader(size_t expected_index) const;
+  ::testing::AssertionResult ValidateIndexedHeader(
+      uint64_t expected_index) const;
 
   // Returns success if collected a Header with an indexed name and literal
   // value (i.e. OnStartLiteralHeader was called with a non-zero index for