Implement delete methods for the various CannedBrowsingDataHelpers.

chrome/browser/browsing_data/browsing_data_file_system_helper.h

Index: chrome/browser/browsing_data/browsing_data_file_system_helper.h
diff --git a/chrome/browser/browsing_data/browsing_data_file_system_helper.h b/chrome/browser/browsing_data/browsing_data_file_system_helper.h
index d0c1b6fed6886e11a5e17f62e3880cf7b4c623ce..9e811576bf4e4c4b0582f75d219eb6a4f7e8cd12 100644
--- a/chrome/browser/browsing_data/browsing_data_file_system_helper.h
+++ b/chrome/browser/browsing_data/browsing_data_file_system_helper.h
@@ -46,7 +46,7 @@ class BrowsingDataFileSystemHelper
   // Detailed information about a file system, including it's origin GURL,
   // the amount of data (in bytes) for each sandboxed filesystem type.
   struct FileSystemInfo {
-    FileSystemInfo(const GURL& origin);
+    explicit FileSystemInfo(const GURL& origin);
     ~FileSystemInfo();
 
     // The origin for which the information is relevant.
@@ -144,10 +144,6 @@ class CannedBrowsingDataFileSystemHelper
   CannedBrowsingDataFileSystemHelper();
   virtual ~CannedBrowsingDataFileSystemHelper();
 
-  // Triggers the success callback as the end of a StartFetching workflow. This
-  // must be called on the UI thread.
-  void NotifyOnUIThread();
-
   // Holds the current list of filesystems returned to the client. Access to
   // |file_system_info_| is triggered indirectly via the UI thread and guarded
   // by |is_fetching_|. This means |file_system_info_| is only accessed while