[Sync] Fix namespaces for the browser_sync component.

chrome/browser/ui/sync/one_click_signin_sync_observer.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_SYNC_ONE_CLICK_SIGNIN_SYNC_OBSERVER_H_
 #define CHROME_BROWSER_UI_SYNC_ONE_CLICK_SIGNIN_SYNC_OBSERVER_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "components/sync/driver/sync_service_observer.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "url/gurl.h"
 
+namespace browser_sync {
 class ProfileSyncService;
+}
 
 namespace content {
 class WebContents;
 }
 
 class OneClickSigninSyncObserver : public content::WebContentsObserver,
                                    public sync_driver::SyncServiceObserver {
  public:
   // Waits for Sync to be initialized, then navigates the |web_contents| to the
   // |continue_url|.  Instances of this class delete themselves once the job is
@@ skipping 10 matching lines @@
   void WebContentsDestroyed() override;
 
   // sync_driver::SyncServiceObserver:
   void OnStateChanged() override;
 
   // Loads the |continue_url_| in the |web_contents()|.
   void LoadContinueUrl();
 
   // Returns the ProfileSyncService associated with the |web_contents|.
   // The returned value may be NULL.
-  ProfileSyncService* GetSyncService(content::WebContents* web_contents);
+  browser_sync::ProfileSyncService* GetSyncService(
+      content::WebContents* web_contents);
 
   // Deletes the |observer|. Intended to be used as a callback for base::Bind.
   static void DeleteObserver(
       base::WeakPtr<OneClickSigninSyncObserver> observer);
 
   // The URL to redirect to once Sync is initialized.
   const GURL continue_url_;
 
   base::WeakPtrFactory<OneClickSigninSyncObserver> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(OneClickSigninSyncObserver);
 };
 
 #endif  // CHROME_BROWSER_UI_SYNC_ONE_CLICK_SIGNIN_SYNC_OBSERVER_H_