Delete Tracked, and move Location to its own file.

chrome/browser/sync/js/js_sync_manager_observer.cc

 // Copyright (c) 2011 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/sync/js/js_sync_manager_observer.h"
 
 #include <cstddef>
 
+#include "base/location.h"
 #include "base/logging.h"
-#include "base/tracked.h"
 #include "base/values.h"
 #include "chrome/browser/sync/internal_api/change_record.h"
 #include "chrome/browser/sync/js/js_arg_list.h"
 #include "chrome/browser/sync/js/js_event_details.h"
 #include "chrome/browser/sync/js/js_event_handler.h"
 #include "chrome/browser/sync/sessions/session_state.h"
 #include "chrome/browser/sync/syncable/model_type.h"
 
 namespace browser_sync {
 
@@ skipping 145 matching lines @@
     const std::string& name, const JsEventDetails& details) {
   if (!event_handler_.IsInitialized()) {
     NOTREACHED();
     return;
   }
   event_handler_.Call(from_here,
                       &JsEventHandler::HandleJsEvent, name, details);
 }
 
 }  // namespace browser_sync