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

chrome/browser/chromeos/drive/drive_cache_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_CACHE_OBSERVER_H_
 #define CHROME_BROWSER_CHROMEOS_DRIVE_DRIVE_CACHE_OBSERVER_H_
 
 #include <string>
 
-namespace gdata {
+namespace drive {
 
 // Interface for classes that need to observe events from DriveCache.
 // All events are notified on UI thread.
 class DriveCacheObserver {
  public:
   // Triggered when a file has been pinned successfully.
   virtual void OnCachePinned(const std::string& resource_id,
                              const std::string& md5) {}
 
   // Triggered when a file has been unpinned successfully.
   virtual void OnCacheUnpinned(const std::string& resource_id,
                                const std::string& md5) {}
 
   // Triggered when a dirty file has been committed (saved) successfully.
   virtual void OnCacheCommitted(const std::string& resource_id) {}
 
  protected:
   virtual ~DriveCacheObserver() {}
 };
 
-}  // namespace gdata
+}  // namespace drive
 
 #endif  // CHROME_BROWSER_CHROMEOS_DRIVE_DRIVE_CACHE_OBSERVER_H_