drive: Use "/drive/root" namespace and fix Files app and tests.

chrome/browser/chromeos/drive/drive_resource_metadata.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_RESOURCE_METADATA_H_
 #define CHROME_BROWSER_CHROMEOS_DRIVE_DRIVE_RESOURCE_METADATA_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 51 matching lines @@
 
 // File type on the drive file system can be either a regular file or
 // a hosted document.
 enum DriveFileType {
   REGULAR_FILE,
   HOSTED_DOCUMENT,
 };
 
 // This should be incremented when incompatibility change is made in
 // drive.proto.
-const int32 kProtoVersion = 2;
+const int32 kProtoVersion = 3;
 
 // Callback similar to FileOperationCallback but with a given |file_path|.
 // Used for operations that change a file path like moving files.
 typedef base::Callback<void(DriveFileError error,
                             const base::FilePath& file_path)>
     FileMoveCallback;
 
 // Used to get entry info from the file system.
 // If |error| is not DRIVE_FILE_OK, |entry_info| is set to NULL.
 typedef base::Callback<void(DriveFileError error,
@@ skipping 305 matching lines @@
   // This should remain the last member so it'll be destroyed first and
   // invalidate its weak pointers before other members are destroyed.
   base::WeakPtrFactory<DriveResourceMetadata> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DriveResourceMetadata);
 };
 
 }  // namespace drive
 
 #endif  // CHROME_BROWSER_CHROMEOS_DRIVE_DRIVE_RESOURCE_METADATA_H_