Fix compile failures in Chrome OS and Views builds.

chrome/browser/chromeos/synaptics_library.cc

 // Copyright (c) 2009 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 "chrome/browser/chromeos/synaptics_library.h"
 
 #include "base/message_loop.h"
 #include "chrome/browser/chrome_thread.h"
 #include "chrome/browser/chromeos/cros_library.h"
 
@@ skipping 18 matching lines @@
     value = 1;
   if (value > 10)
     value = 10;
   SetParameter(param, value);
 }
 
 void SynapticsLibrary::SetParameter(SynapticsParameter param, int value) {
   if (CrosLibrary::loaded()) {
     // This calls SetSynapticsParameter in the cros library which is
     // potentially time consuming. So we run this on the FILE thread.
-    MessageLoop* loop = ChromeThread::GetMessageLoop(ChromeThread::FILE);
-    if (loop) {
-      loop->PostTask(FROM_HERE, NewRunnableFunction(
-          &SetSynapticsParameter, param, value));
-    }
+    ChromeThread::PostTask(
+        ChromeThread::FILE, FROM_HERE,
+        NewRunnableFunction(&SetSynapticsParameter, param, value));
   }
 }
 
 }  // namespace chromeos