Use a direct include of utf_string_conversions.h in chrome/browser/, part 3.

chrome/browser/tab_contents/spelling_menu_observer.cc

 // Copyright (c) 2012 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 "chrome/browser/tab_contents/spelling_menu_observer.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/i18n/case_conversion.h"
 #include "base/prefs/pref_service.h"
-#include "base/utf_string_conversions.h"
+#include "base/strings/utf_string_conversions.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/spellchecker/spellcheck_factory.h"
 #include "chrome/browser/spellchecker/spellcheck_host_metrics.h"
 #include "chrome/browser/spellchecker/spellcheck_platform_mac.h"
 #include "chrome/browser/spellchecker/spellcheck_service.h"
 #include "chrome/browser/spellchecker/spelling_service_client.h"
 #include "chrome/browser/tab_contents/render_view_context_menu.h"
 #include "chrome/browser/tab_contents/spelling_bubble_model.h"
 #include "chrome/browser/ui/confirm_bubble.h"
@@ skipping 388 matching lines @@
 void SpellingMenuObserver::OnAnimationTimerExpired() {
   // Append '.' characters to the end of "Checking".
   loading_frame_ = (loading_frame_ + 1) & 3;
   string16 loading_message = loading_message_ + string16(loading_frame_,'.');
 
   // Update the menu item with the text. We disable this item to prevent users
   // from selecting it.
   proxy_->UpdateMenuItem(IDC_CONTENT_CONTEXT_SPELLING_SUGGESTION, false, false,
                          loading_message);
 }