Remove legacy StartsWithASCII function.

components/invalidation/impl/gcm_network_channel_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/run_loop.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "base/thread_task_runner_handle.h"
 #include "components/invalidation/impl/gcm_network_channel.h"
 #include "google_apis/gaia/google_service_auth_error.h"
@@ skipping 215 matching lines @@
   int url_fetchers_created_count_;
   std::string last_echo_token_;
   InvalidatorState last_invalidator_state_;
 };
 
 void TestNetworkChannelURLFetcher::AddExtraRequestHeader(
     const std::string& header_line) {
   net::FakeURLFetcher::AddExtraRequestHeader(header_line);
   std::string header_name("echo-token: ");
   std::string echo_token;
-  if (base::StartsWithASCII(header_line, header_name, false)) {
+  if (base::StartsWith(header_line, header_name,
+                       base::CompareCase::INSENSITIVE_ASCII)) {
     echo_token = header_line;
     base::ReplaceFirstSubstringAfterOffset(
         &echo_token, 0, header_name, std::string());
     test_->set_last_echo_token(echo_token);
   }
 }
 
 TEST_F(GCMNetworkChannelTest, HappyCase) {
   EXPECT_EQ(TRANSIENT_INVALIDATION_ERROR, get_last_invalidator_state());
   EXPECT_FALSE(delegate()->message_callback.is_null());
@@ skipping 257 matching lines @@
   delegate()->request_token_callback.Run(
       GoogleServiceAuthError::AuthErrorNone(), "access.token");
   RunLoopUntilIdle();
   EXPECT_EQ(url_fetchers_created_count(), 3);
   // Echo_token should be from second message.
   EXPECT_EQ("echo.token", get_last_echo_token());
 }
 #endif
 
 }  // namespace syncer