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

Source/modules/webdatabase/DOMWindowWebDatabase.cpp

Index: Source/modules/webdatabase/DOMWindowWebDatabase.cpp
diff --git a/Source/modules/webdatabase/DOMWindowWebDatabase.cpp b/Source/modules/webdatabase/DOMWindowWebDatabase.cpp
index 59cd30231c7df0280c43530ac3fdde181ae1617d..0524d863b30ee8b1fc358f89d6a7ae70f3e80c10 100644
--- a/Source/modules/webdatabase/DOMWindowWebDatabase.cpp
+++ b/Source/modules/webdatabase/DOMWindowWebDatabase.cpp
@@ -40,8 +40,9 @@
 
 namespace blink {
 
-Database* DOMWindowWebDatabase::openDatabase(LocalDOMWindow& window, const String& name, const String& version, const String& displayName, unsigned long estimatedSize, DatabaseCallback* creationCallback, ExceptionState& exceptionState)
+Database* DOMWindowWebDatabase::openDatabase(DOMWindow& windowArg, const String& name, const String& version, const String& displayName, unsigned long estimatedSize, DatabaseCallback* creationCallback, ExceptionState& exceptionState)
 {
+    LocalDOMWindow& window = toLocalDOMWindow(windowArg);
     if (!window.isCurrentlyDisplayedInFrame())
         return nullptr;