drive: Rename 'gdata' namespace to 'drive' in chrome/browser/chromeos/drive

chrome/browser/chromeos/drive/drive_file_system_observer.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_DRIVE_DRIVE_FILE_SYSTEM_OBSERVER_H_
 #define CHROME_BROWSER_CHROMEOS_DRIVE_DRIVE_FILE_SYSTEM_OBSERVER_H_
 
 #include "chrome/browser/chromeos/drive/drive_file_error.h"
 
 class FilePath;
 
-namespace gdata {
+namespace drive {
 
 // Interface for classes that need to observe events from classes implementing
 // DriveFileSystemInterface.
 // All events are notified on UI thread.
 class DriveFileSystemObserver {
  public:
   // Triggered when a content of a directory has been changed.
   // |directory_path| is a virtual directory path (/drive/...) representing
   // changed directory.
   virtual void OnDirectoryChanged(const FilePath& directory_path) {
@@ skipping 17 matching lines @@
   }
 
   // Triggered when the file system is being unmounted.
   virtual void OnFileSystemBeingUnmounted() {
   }
 
  protected:
   virtual ~DriveFileSystemObserver() {}
 };
 
-}  // namespace gdata
+}  // namespace drive
 
 #endif  // CHROME_BROWSER_CHROMEOS_DRIVE_DRIVE_FILE_SYSTEM_OBSERVER_H_