Remove legacy StartsWithASCII function.

extensions/browser/guest_view/web_view/web_view_guest.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 "extensions/browser/guest_view/web_view/web_view_guest.h"
 
 #include "base/message_loop/message_loop.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "components/browsing_data/storage_partition_http_cache_data_remover.h"
@@ skipping 135 matching lines @@
                          bool* persist_storage) {
   std::string partition_str;
   if (!create_params.GetString(webview::kStoragePartitionId, &partition_str)) {
     return;
   }
 
   // Since the "persist:" prefix is in ASCII, base::StartsWith will work fine on
   // UTF-8 encoded |partition_id|. If the prefix is a match, we can safely
   // remove the prefix without splicing in the middle of a multi-byte codepoint.
   // We can use the rest of the string as UTF-8 encoded one.
-  if (base::StartsWithASCII(partition_str, "persist:", true)) {
+  if (base::StartsWith(partition_str, "persist:",
+                       base::CompareCase::SENSITIVE)) {
     size_t index = partition_str.find(":");
     CHECK(index != std::string::npos);
     // It is safe to do index + 1, since we tested for the full prefix above.
     *storage_partition_id = partition_str.substr(index + 1);
 
     if (storage_partition_id->empty()) {
       // TODO(lazyboy): Better way to deal with this error.
       return;
     }
     *persist_storage = true;
@@ skipping 1283 matching lines @@
     scoped_ptr<base::DictionaryValue> args(new base::DictionaryValue());
     DispatchEventToView(
         new GuestViewEvent(webview::kEventExitFullscreen, args.Pass()));
   }
   // Since we changed fullscreen state, sending a Resize message ensures that
   // renderer/ sees the change.
   web_contents()->GetRenderViewHost()->WasResized();
 }
 
 }  // namespace extensions