Allow sync with 2-factor StrongAuth accounts in ChromeOS.

chrome/browser/sync/profile_sync_service.h

Index: chrome/browser/sync/profile_sync_service.h
diff --git a/chrome/browser/sync/profile_sync_service.h b/chrome/browser/sync/profile_sync_service.h
index d4cb576cf49dfb2b2ac6cc3bef32b72e41266d20..02ad336fb5d1dc3390c911a672fd1aa64427cae8 100644
--- a/chrome/browser/sync/profile_sync_service.h
+++ b/chrome/browser/sync/profile_sync_service.h
@@ -355,8 +355,9 @@ class ProfileSyncService : public browser_sync::SyncFrontend,
   bool ShouldPushChanges();
 
   const GURL& sync_service_url() const { return sync_service_url_; }
+  SigninManager* signin() { return signin_.get(); }
+  const std::string& cros_user() const { return cros_user_; }
 
-  SigninManager* signin() { return &signin_; }
  protected:
   // Used by ProfileSyncServiceMock only.
   //
@@ -463,7 +464,7 @@ class ProfileSyncService : public browser_sync::SyncFrontend,
   SyncSetupWizard wizard_;
 
   // Encapsulates user signin with TokenService.
-  SigninManager signin_;
+  scoped_ptr<SigninManager> signin_;
 
   // True if an unrecoverable error (e.g. violation of an assumed invariant)
   // occurred during syncer operation.  This value should be checked before