Remove unnecessary utilities from drive::util.

chrome/browser/drive/drive_api_util.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_DRIVE_DRIVE_API_UTIL_H_
 #define CHROME_BROWSER_DRIVE_DRIVE_API_UTIL_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 91 matching lines @@
 ConvertFileListToResourceList(const google_apis::FileList& file_list);
 
 // Converts ChangeList to ResourceList.
 scoped_ptr<google_apis::ResourceList>
 ConvertChangeListToResourceList(const google_apis::ChangeList& change_list);
 
 // Returns the (base-16 encoded) MD5 digest of the file content at |file_path|,
 // or an empty string if an error is found.
 std::string GetMd5Digest(const base::FilePath& file_path);
 
-// The resource ID for the root directory for WAPI is defined in the spec:
-// https://developers.google.com/google-apps/documents-list/
-extern const char kWapiRootDirectoryResourceId[];
-
 // Returns preferred file extension for hosted documents which have given mime
 // type. If the given mime type is not known as one for hosted documents,
 // returns empty string.
 std::string GetHostedDocumentExtension(const std::string& mime_type);
 
-// Returns mime type for hosted documents which have given extension in form
-// ".xxx". If the given extension is not known as one for hosted documents,
-// returns empty string.
-std::string GetHostedDocumentMimeType(const std::string& extension);
-
 // Returns true if the given mime type is corresponding to one of hosted
 // documents.
 bool IsHostedDocument(const std::string& mime_type);
 
 // Returns true if the given extension is corresponding to one of hosted
 // documents.
 bool IsHostedDocumentByExtension(const std::string& extension);
 
 }  // namespace util
 }  // namespace drive
 
 #endif  // CHROME_BROWSER_DRIVE_DRIVE_API_UTIL_H_