Remove calls to MessageLoop(ForUI|ForIO)::Run/RunUntilIdle.

base/cancelable_callback.h

 // 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.
 //
 // CancelableCallback is a wrapper around base::Callback that allows
 // cancellation of a callback. CancelableCallback takes a reference on the
 // wrapped callback until this object is destroyed or Reset()/Cancel() are
 // called.
 //
 // NOTE:
 //
 // Calling CancelableCallback::Cancel() brings the object back to its natural,
 // default-constructed state, i.e., CancelableCallback::callback() will return
 // a null callback.
 //
 // THREAD-SAFETY:
 //
 // CancelableCallback objects must be created on, posted to, cancelled on, and
 // destroyed on the same thread.
 //
 //
 // EXAMPLE USAGE:
 //
 // In the following example, the test is verifying that RunIntensiveTest()
 // Quit()s the message loop within 4 seconds. The cancelable callback is posted
 // to the message loop, the intensive test runs, the message loop is run,
 // then the callback is cancelled.
 //
+// RunLoop run_loop;
+//
 // void TimeoutCallback(const std::string& timeout_message) {
 //   FAIL() << timeout_message;
-//   MessageLoop::current()->QuitWhenIdle();
+//   run_loop.QuitWhenIdle();
 // }
 //
 // CancelableClosure timeout(base::Bind(&TimeoutCallback, "Test timed out."));
-// MessageLoop::current()->PostDelayedTask(FROM_HERE, timeout.callback(),
-//                                         4000)  // 4 seconds to run.
+// ThreadTaskRunnerHandle::Get()->PostDelayedTask(FROM_HERE, timeout.callback(),
+//                                                TimeDelta::FromSeconds(4));
 // RunIntensiveTest();
-// MessageLoop::current()->Run();
+// run_loop.Run();
 // timeout.Cancel();  // Hopefully this is hit before the timeout callback runs.
 //
 
 #ifndef BASE_CANCELABLE_CALLBACK_H_
 #define BASE_CANCELABLE_CALLBACK_H_
 
 #include <utility>
 
 #include "base/base_export.h"
 #include "base/bind.h"
@@ skipping 76 matching lines @@
   base::WeakPtrFactory<CancelableCallback<void(A...)>> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CancelableCallback);
 };
 
 typedef CancelableCallback<void(void)> CancelableClosure;
 
 }  // namespace base
 
 #endif  // BASE_CANCELABLE_CALLBACK_H_