Split PrefService into PrefService, PrefServiceSimple and PrefServiceSyncable.

chrome/test/base/testing_browser_process.cc

Index: chrome/test/base/testing_browser_process.cc
diff --git a/chrome/test/base/testing_browser_process.cc b/chrome/test/base/testing_browser_process.cc
index fc0a3f7ba38efe97a42255407081e8732e132f4a..0054fc8adf9dd777a557d22da65fd68c057d4730 100644
--- a/chrome/test/base/testing_browser_process.cc
+++ b/chrome/test/base/testing_browser_process.cc
@@ -82,7 +82,7 @@ void TestingBrowserProcess::SetProfileManager(ProfileManager* profile_manager) {
 #endif
 }
 
-PrefService* TestingBrowserProcess::local_state() {
+PrefServiceSimple* TestingBrowserProcess::local_state() {
   return local_state_;
 }
 
@@ -318,7 +318,7 @@ void TestingBrowserProcess::SetSystemRequestContext(
   system_request_context_ = context_getter;
 }
 
-void TestingBrowserProcess::SetLocalState(PrefService* local_state) {
+void TestingBrowserProcess::SetLocalState(PrefServiceSimple* local_state) {
   if (!local_state) {
     // The local_state_ PrefService is owned outside of TestingBrowserProcess,
     // but some of the members of TestingBrowserProcess hold references to it