Rename GDataFileSystem* to DriveFileSystem*

chrome/browser/chromeos/gdata/mock_directory_change_observer.h

Index: chrome/browser/chromeos/gdata/mock_directory_change_observer.h
diff --git a/chrome/browser/chromeos/gdata/mock_directory_change_observer.h b/chrome/browser/chromeos/gdata/mock_directory_change_observer.h
index 95cf2209e584b71b19727ddcb0faa70e2a6f5fb6..56dc1bf3fc9465e22bdb934ba222f7297f1486dd 100644
--- a/chrome/browser/chromeos/gdata/mock_directory_change_observer.h
+++ b/chrome/browser/chromeos/gdata/mock_directory_change_observer.h
@@ -5,18 +5,18 @@
 #ifndef CHROME_BROWSER_CHROMEOS_GDATA_MOCK_DIRECTORY_CHANGE_OBSERVER_H_
 #define CHROME_BROWSER_CHROMEOS_GDATA_MOCK_DIRECTORY_CHANGE_OBSERVER_H_
 
-#include "chrome/browser/chromeos/gdata/gdata_file_system_interface.h"
+#include "chrome/browser/chromeos/gdata/drive_file_system_interface.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 namespace gdata {
 
-// Mock for GDataFileSystemInterface::Observer::OnDirectoryChanged().
-class MockDirectoryChangeObserver : public GDataFileSystemInterface::Observer {
+// Mock for DriveFileSystemInterface::Observer::OnDirectoryChanged().
+class MockDirectoryChangeObserver : public DriveFileSystemInterface::Observer {
  public:
   MockDirectoryChangeObserver();
   virtual ~MockDirectoryChangeObserver();
 
-  // GDataFileSystemInterface::Observer overrides.
+  // DriveFileSystemInterface::Observer overrides.
   MOCK_METHOD1(OnDirectoryChanged, void(const FilePath& directory_path));
 };