Componentize PrefSyncableService and support classes.

chrome/browser/font_family_cache_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 "chrome/browser/font_family_cache.h"
 
 #include "base/strings/utf_string_conversions.h"
-#include "chrome/test/base/testing_pref_service_syncable.h"
 #include "chrome/test/base/testing_profile.h"
+#include "components/syncable_prefs/testing_pref_service_syncable.h"
 #include "content/public/test/test_browser_thread_bundle.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 
 class TestingFontFamilyCache : public FontFamilyCache {
  public:
   explicit TestingFontFamilyCache(Profile* profile)
       : FontFamilyCache(profile), fetch_font_count_(0) {}
   ~TestingFontFamilyCache() override {}
@@ skipping 48 matching lines @@
   EXPECT_EQ(font1, result);
   EXPECT_EQ(1, cache.fetch_font_count_);
 
   // Changing the preferences invalidates the cache.
   prefs->SetString(pref_name.c_str(), font2.c_str());
   result = base::UTF16ToUTF8(
       cache.FetchAndCacheFont(script.c_str(), map_name.c_str()));
   EXPECT_EQ(font2, result);
   EXPECT_EQ(2, cache.fetch_font_count_);
 }