Avoid useless SYNC_CYCLE_CONTINUATION sync cycle

chrome/browser/sync/glue/ui_model_worker_unittest.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 "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/thread.h"
 #include "chrome/browser/sync/glue/ui_model_worker.h"
-#include "chrome/browser/sync/util/unrecoverable_error_info.h"
 #include "content/test/test_browser_thread.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using browser_sync::UIModelWorker;
-using browser_sync::UnrecoverableErrorInfo;
+using browser_sync::SyncerError;
 using content::BrowserThread;
 
 // Various boilerplate, primarily for the StopWithPendingWork test.
 
 class UIModelWorkerVisitor {
  public:
   UIModelWorkerVisitor(base::WaitableEvent* was_run,
                        bool quit_loop)
      : quit_loop_when_run_(quit_loop),
        was_run_(was_run) { }
   virtual ~UIModelWorkerVisitor() { }
 
-  virtual UnrecoverableErrorInfo DoWork() {
+  virtual SyncerError DoWork() {
     EXPECT_TRUE(BrowserThread::CurrentlyOn(BrowserThread::UI));
     was_run_->Signal();
     if (quit_loop_when_run_)
       MessageLoop::current()->Quit();
-    return UnrecoverableErrorInfo();
+    return browser_sync::NO_ERROR;
   }
 
  private:
   bool quit_loop_when_run_;
   base::WaitableEvent* was_run_;
   DISALLOW_COPY_AND_ASSIGN(UIModelWorkerVisitor);
 };
 
 // A faux-syncer that only interacts with its model safe worker.
 class Syncer {
@@ skipping 155 matching lines @@
 
   // This is what gets the UI thread blocked until NotifyExitRequested,
   // which is called when FakeSyncapiShutdownCallback runs and deletes the
   // syncer.
   bmw()->Stop();
 
   // Was the thread killed?
   EXPECT_FALSE(syncer_thread()->IsRunning());
   core_thread()->Stop();
 }