[Sync] Fix namespaces for the browser_sync component.

chrome/browser/ui/sync/one_click_signin_sync_starter.h

Index: chrome/browser/ui/sync/one_click_signin_sync_starter.h
diff --git a/chrome/browser/ui/sync/one_click_signin_sync_starter.h b/chrome/browser/ui/sync/one_click_signin_sync_starter.h
index 8bd0dae64c80eeb7e004d18f1c9e2dc0717ad2dc..cef4c3a98eac9685241588b5162dd385e980536c 100644
--- a/chrome/browser/ui/sync/one_click_signin_sync_starter.h
+++ b/chrome/browser/ui/sync/one_click_signin_sync_starter.h
@@ -20,7 +20,10 @@
 #include "content/public/browser/web_contents_observer.h"
 
 class Browser;
+
+namespace browser_sync {
 class ProfileSyncService;
+}  // namespace browser_sync
 
 namespace content {
 class WebContents;
@@ -197,7 +200,7 @@ class OneClickSigninSyncStarter : public SigninTracker::Observer,
   // disabled during setup. In this case GetProfileSyncService will return NULL,
   // but we still need to call PSS::SetSetupInProgress(false). For this purpose
   // call FinishProfileSyncServiceSetup() function.
-  ProfileSyncService* GetProfileSyncService();
+  browser_sync::ProfileSyncService* GetProfileSyncService();
 
   void FinishProfileSyncServiceSetup();