Split testing_pref_service.h/.cc into two parts, generic vs. Chrome-specific.

chrome/browser/chromeos/input_method/input_method_persistence_unittest.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/chromeos/input_method/input_method_persistence.h"
 
 #include "base/command_line.h"
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/chromeos/input_method/mock_input_method_manager.h"
 #include "chrome/browser/chromeos/language_preferences.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/test/base/testing_browser_process.h"
-#include "chrome/test/base/testing_pref_service.h"
+#include "chrome/test/base/testing_pref_service_syncable.h"
 #include "chrome/test/base/testing_profile.h"
 #include "chrome/test/base/testing_profile_manager.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace chromeos {
 namespace input_method {
 
 namespace {
 const char kInputId1[] = "xkb:us:dvorak:eng";
@@ skipping 74 matching lines @@
   VerifyPrefs(kInputId2, "", kInputId2);
 
   persistence.OnSessionStateChange(InputMethodManager::STATE_BROWSER_SCREEN);
   mock_manager_.SetCurrentInputMethodId(kInputId1);
   persistence.InputMethodChanged(&mock_manager_, false);
   VerifyPrefs(kInputId1, kInputId2, kInputId2);
 }
 
 }  // namespace input_method
 }  // namespace chromeos