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

chrome/browser/printing/cloud_print/cloud_print_proxy_service_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 <string>
 
 #include "base/command_line.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "chrome/browser/printing/cloud_print/cloud_print_proxy_service.h"
 #include "chrome/browser/printing/cloud_print/cloud_print_proxy_service_factory.h"
 #include "chrome/browser/service/service_process_control.h"
 #include "chrome/browser/ui/startup/startup_browser_creator.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/cloud_print/cloud_print_proxy_info.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/service_messages.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 "content/public/browser/browser_thread.h"
 #include "content/public/test/test_browser_thread.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using ::testing::Assign;
 using ::testing::AtMost;
 using ::testing::DeleteArg;
@@ skipping 412 matching lines @@
 
   CloudPrintProxyServiceFactory::GetInstance()->
       SetTestingFactory(&profile_, TestCloudPrintProxyServiceFactory);
 
   CommandLine command_line(CommandLine::NO_PROGRAM);
   command_line.AppendSwitch(switches::kCheckCloudPrintConnectorPolicy);
 
   EXPECT_FALSE(LaunchBrowser(command_line, &profile_));
   MessageLoop::current()->RunUntilIdle();
 }