[MemoryPressure] Move chrome/browser/chromeos/* to chrome/browser/memory/*.

chrome/browser/memory/low_memory_observer_chromeos.h

 // Copyright (c) 2012 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.
 
-#ifndef CHROME_BROWSER_CHROMEOS_MEMORY_LOW_MEMORY_OBSERVER_H_
-#define CHROME_BROWSER_CHROMEOS_MEMORY_LOW_MEMORY_OBSERVER_H_
+#ifndef CHROME_BROWSER_MEMORY_LOW_MEMORY_OBSERVER_CHROMEOS_H_
+#define CHROME_BROWSER_MEMORY_LOW_MEMORY_OBSERVER_CHROMEOS_H_
 
 #include "base/memory/ref_counted.h"
 
-namespace chromeos {
+namespace memory {
 
 class LowMemoryObserverImpl;
 
 ////////////////////////////////////////////////////////////////////////////////
 // LowMemoryObserver
 //
 // Class to handle observation of low memory device for changes so that we
 // can get a signal from the kernel about low memory conditions and discard tabs
 // when that happens, instead of waiting for the OOM killer to kill renderers
 // (which is more drastic, but still necessary and possible).
 //
 // This object starts and stops the observation, and can be created or deleted
 // from any thread, but the observation occurs on the FILE thread, and tabs are
 // discarded on the UI thread.
 class LowMemoryObserver {
  public:
   LowMemoryObserver();
   ~LowMemoryObserver();
 
   void Start();
   void Stop();
 
  private:
   scoped_refptr<LowMemoryObserverImpl> observer_;
 
   DISALLOW_COPY_AND_ASSIGN(LowMemoryObserver);
 };
 
-}  // namespace chromeos
+}  // namespace memory
 
-#endif  // CHROME_BROWSER_CHROMEOS_MEMORY_LOW_MEMORY_OBSERVER_H_
+#endif  // CHROME_BROWSER_MEMORY_LOW_MEMORY_OBSERVER_CHROMEOS_H_