Remove calls to deprecated MessageLoop methods in sync.

sync/internal_api/attachments/attachment_service_proxy_unittest.cc

 // 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.
 
 #include "sync/internal_api/public/attachments/attachment_service_proxy.h"
 
 #include <memory>
 
 #include "base/bind.h"
 #include "base/location.h"
@@ skipping 83 matching lines @@
     callback_get_or_download =
         base::Bind(&AttachmentServiceProxyTest::IncrementGetOrDownload,
                    base::Unretained(this));
     count_callback_get_or_download = 0;
   }
 
   void TearDown() override {
     // We must take care to call the stub's destructor on the stub_thread
     // because that's the thread to which its WeakPtrs are bound.
     if (stub) {
-      stub_thread->message_loop()->DeleteSoon(FROM_HERE, stub.release());
+      stub_thread->task_runner()->DeleteSoon(FROM_HERE, stub.release());
       WaitForStubThread();
     }
     stub_thread->Stop();
   }
 
   // a GetOrDownloadCallback
   void IncrementGetOrDownload(const AttachmentService::GetOrDownloadResult&,
                               std::unique_ptr<AttachmentMap>) {
     CalledOnValidThread();
     ++count_callback_get_or_download;
   }
 
   void WaitForStubThread() {
     base::WaitableEvent done(base::WaitableEvent::ResetPolicy::AUTOMATIC,
                              base::WaitableEvent::InitialState::NOT_SIGNALED);
-    stub_thread->message_loop()->PostTask(
+    stub_thread->task_runner()->PostTask(
         FROM_HERE,
         base::Bind(&base::WaitableEvent::Signal, base::Unretained(&done)));
     done.Wait();
   }
 
   base::MessageLoop loop;
   std::unique_ptr<base::Thread> stub_thread;
   std::unique_ptr<StubAttachmentService> stub;
   std::unique_ptr<AttachmentServiceProxy> proxy;
 
@@ skipping 29 matching lines @@
   WaitForStubThread();
   EXPECT_EQ(1, stub->GetCallCount());
   // Wait a second time ensure the stub thread has executed the posted result
   // callbacks.
   WaitForStubThread();
 
   base::RunLoop().RunUntilIdle();
   EXPECT_EQ(1, count_callback_get_or_download);
 
   // Destroy the stub and call GetOrDownloadAttachments again.
-  stub_thread->message_loop()->DeleteSoon(FROM_HERE, stub.release());
+  stub_thread->task_runner()->DeleteSoon(FROM_HERE, stub.release());
   WaitForStubThread();
 
   // Now that the wrapped object has been destroyed, call again and see that we
   // don't crash and the count remains the same.
   proxy->GetOrDownloadAttachments(AttachmentIdList(), callback_get_or_download);
   WaitForStubThread();
   WaitForStubThread();
   base::RunLoop().RunUntilIdle();
   EXPECT_EQ(1, count_callback_get_or_download);
 }
 
 }  // namespace syncer