Bug 1137229 - Fix breakage in IMEInputHandler::OnDestroyWidget(). r=masayuki

widget/cocoa/TextInputHandler.mm

@@ -3367,6 +3367,10 @@ IMEInputHandler::OnDestroyWidget(nsChildView* aDestroyingWidget)
     sFocusedIMEHandler->OnDestroyWidget(aDestroyingWidget);
   }
 
+  if (!TextInputHandlerBase::OnDestroyWidget(aDestroyingWidget)) {
+    return false;
+  }
+
   if (IsIMEComposing()) {
     // If our view is in the composition, we should clean up it.
     CancelIMEComposition();