Wire up the deleteFileSystem operation.

webkit/fileapi/file_system_context.h

Index: webkit/fileapi/file_system_context.h
diff --git a/webkit/fileapi/file_system_context.h b/webkit/fileapi/file_system_context.h
index 12906a977a0dd05bfbfe704a93e2ebe84916cb8f..e44ac102561a1520621ca94894c6669620249e4c 100644
--- a/webkit/fileapi/file_system_context.h
+++ b/webkit/fileapi/file_system_context.h
@@ -108,6 +108,10 @@ class FILEAPI_EXPORT FileSystemContext
                               const std::string& name,
                               const GURL& root)> OpenFileSystemCallback;
 
+  // Used for DeleteFileSystem.
+  typedef base::Callback<void(base::PlatformFileError result)>
+      DeleteFileSystemCallback;
+
   // Opens the filesystem for the given |origin_url| and |type|, and dispatches
   // the DidOpenFileSystem callback of the given |dispatcher|.
   // If |create| is true this may actually set up a filesystem instance
@@ -117,7 +121,13 @@ class FILEAPI_EXPORT FileSystemContext
       const GURL& origin_url,
       FileSystemType type,
       bool create,
-      OpenFileSystemCallback callback);
+      const OpenFileSystemCallback& callback);
+
+  // Deletes the filesystem for the given |origin_url| and |type|.
+  void DeleteFileSystem(
+      const GURL& origin_url,
+      FileSystemType type,
+      const DeleteFileSystemCallback& callback);
 
   // Creates a new FileSystemOperation instance by cracking
   // the given filesystem URL |url| to get an appropriate MountPointProvider