Use DriveResourceMetadataInterface in unit 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 95 matching lines @@
   EntryInfoResult second;  // Only filled if the first entry is found.
 };
 
 // Used to receive the result from GetEntryInfoPairCallback().
 typedef base::Callback<void(scoped_ptr<EntryInfoPairResult> pair_result)>
     GetEntryInfoPairCallback;
 
 // Interface class for resource metadata storage.
 class DriveResourceMetadataInterface {
  public:
+  virtual ~DriveResourceMetadataInterface() {}
+
   // Largest change timestamp that was the source of content for the current
   // state of the root directory.
   virtual void GetLargestChangestamp(
       const GetChangestampCallback& callback) = 0;
   virtual void SetLargestChangestamp(int64 value,
                                      const FileOperationCallback& callback) = 0;
 
   // Adds |entry| to directory with path |directory_path| and invoke the
   // callback asynchronously. |callback| must not be null.
   virtual void AddEntryToDirectory(const FilePath& directory_path,
@@ skipping 65 matching lines @@
   // Recursively get child directories of entry pointed to by |resource_id|.
   virtual void GetChildDirectories(
       const std::string& resource_id,
       const GetChildDirectoriesCallback& changed_dirs_callback) = 0;
 
   // Removes all files/directories under root (not including root).
   virtual void RemoveAll(const base::Closure& callback) = 0;
 
  protected:
   DriveResourceMetadataInterface() {}
-  virtual ~DriveResourceMetadataInterface() {}
 };
 
 // Storage for Drive Metadata.
 class DriveResourceMetadata : public DriveResourceMetadataInterface {
  public:
   // Map of resource id and serialized DriveEntry.
   typedef std::map<std::string, std::string> SerializedMap;
   // Map of resource id strings to DriveEntry*.
   typedef std::map<std::string, DriveEntry*> ResourceMap;
 
@@ skipping 154 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_