[Sync] Convert DTCs to be not RefCounted and NonThreadSafe.

chrome/browser/sync/glue/theme_data_type_controller.cc

Index: chrome/browser/sync/glue/theme_data_type_controller.cc
diff --git a/chrome/browser/sync/glue/theme_data_type_controller.cc b/chrome/browser/sync/glue/theme_data_type_controller.cc
index a375b1b500ce12b3b7b452141af810484787c48d..16cfcc8b6379d4d56094b93f9d7fb4d34c36f5f2 100644
--- a/chrome/browser/sync/glue/theme_data_type_controller.cc
+++ b/chrome/browser/sync/glue/theme_data_type_controller.cc
@@ -5,27 +5,21 @@
 #include "chrome/browser/sync/glue/theme_data_type_controller.h"
 
 #include "chrome/browser/profiles/profile.h"
-#include "content/public/browser/browser_thread.h"
 #include "extensions/browser/extension_system.h"
 
-using content::BrowserThread;
-
 namespace browser_sync {
 
 ThemeDataTypeController::ThemeDataTypeController(
-    const base::Closure& error_callback,
+    const base::Closure& dump_stack,
     sync_driver::SyncClient* sync_client,
     Profile* profile)
-    : UIDataTypeController(
-          BrowserThread::GetTaskRunnerForThread(BrowserThread::UI),
-          error_callback,
-          syncer::THEMES,
-          sync_client),
+    : UIDataTypeController(syncer::THEMES, dump_stack, sync_client),
       profile_(profile) {}
 
 ThemeDataTypeController::~ThemeDataTypeController() {}
 
 bool ThemeDataTypeController::StartModels() {
+  DCHECK(CalledOnValidThread());
   extensions::ExtensionSystem::Get(profile_)->InitForRegularProfile(true);
   return true;
 }