Bug 1130935 - mingw fixup.

widget/windows/nsIMM32Handler.cpp

@@ -249,7 +249,7 @@ nsIMM32Handler::InitKeyboardLayout(nsWindow* aWindow,
     // Add room for the terminating null character
     sIMEName.SetLength(++IMENameLength);
     IMENameLength =
-      ::ImmGetDescriptionW(aKeyboardLayout, sIMEName.BeginWriting(),
+      ::ImmGetDescriptionW(aKeyboardLayout, wwc(sIMEName.BeginWriting()),
                            IMENameLength);
     // Adjust the length to ignore the terminating null character
     sIMEName.SetLength(IMENameLength);