Use new API to download blobs from Google Drive.

google_apis/drive/drive_api_url_generator.h

Index: google_apis/drive/drive_api_url_generator.h
diff --git a/google_apis/drive/drive_api_url_generator.h b/google_apis/drive/drive_api_url_generator.h
index fabfe3d133386d95e42f188a2087f2788b72b0aa..af07333073254c422f8781f7589603fdd77d2d3a 100644
--- a/google_apis/drive/drive_api_url_generator.h
+++ b/google_apis/drive/drive_api_url_generator.h
@@ -21,16 +21,12 @@ class DriveApiUrlGenerator {
   // |base_url| is the path to the target drive api server.
   // Note that this is an injecting point for a testing server.
   DriveApiUrlGenerator(const GURL& base_url,
-                       const GURL& base_download_url,
                        const GURL& base_thumbnail_url);
   ~DriveApiUrlGenerator();
 
   // The base URL for communicating with the production drive api server.
   static const char kBaseUrlForProduction[];
 
-  // The base URL for the file download server for production.
-  static const char kBaseDownloadUrlForProduction[];
-
   // The base URL for the thumbnail download server for production.
   static const char kBaseThumbnailUrlForProduction[];