Extract a DOMWindow interface from LocalDOMWindow and use it in the idl.

Source/modules/filesystem/DOMWindowFileSystem.cpp

Index: Source/modules/filesystem/DOMWindowFileSystem.cpp
diff --git a/Source/modules/filesystem/DOMWindowFileSystem.cpp b/Source/modules/filesystem/DOMWindowFileSystem.cpp
index bc491298ed92293432d863f2d7c98bd8f0a79233..cdc1617416ec47ee77afb26bb82f03077acc7e69 100644
--- a/Source/modules/filesystem/DOMWindowFileSystem.cpp
+++ b/Source/modules/filesystem/DOMWindowFileSystem.cpp
@@ -48,8 +48,9 @@ DOMWindowFileSystem::~DOMWindowFileSystem()
 {
 }
 
-void DOMWindowFileSystem::webkitRequestFileSystem(LocalDOMWindow& window, int type, long long size, FileSystemCallback* successCallback, ErrorCallback* errorCallback)
+void DOMWindowFileSystem::webkitRequestFileSystem(DOMWindow& windowArg, int type, long long size, FileSystemCallback* successCallback, ErrorCallback* errorCallback)
 {
+    LocalDOMWindow& window = toLocalDOMWindow(windowArg);
     if (!window.isCurrentlyDisplayedInFrame())
         return;
 
@@ -71,8 +72,9 @@ void DOMWindowFileSystem::webkitRequestFileSystem(LocalDOMWindow& window, int ty
     LocalFileSystem::from(*document)->requestFileSystem(document, fileSystemType, size, FileSystemCallbacks::create(successCallback, errorCallback, document, fileSystemType));
 }
 
-void DOMWindowFileSystem::webkitResolveLocalFileSystemURL(LocalDOMWindow& window, const String& url, EntryCallback* successCallback, ErrorCallback* errorCallback)
+void DOMWindowFileSystem::webkitResolveLocalFileSystemURL(DOMWindow& windowArg, const String& url, EntryCallback* successCallback, ErrorCallback* errorCallback)
 {
+    LocalDOMWindow& window = toLocalDOMWindow(windowArg);
     if (!window.isCurrentlyDisplayedInFrame())
         return;