Bug 1191862 - part 1: Make nsIWidget::NativeKeyBindingsType independent from nsIWidget and defined in an independent header file r=smaug

I'd like to use it in `IMEData.h`.  However, adding new include into it may
cause bustage with MinGW, and it's included by `nsIWidget.h` because `nsIWidget`
requires some classes defined in `IMEData.h`.  Therefore, I'd like to make a
new header file for avoiding the include hell.

Differential Revision: https://phabricator.services.mozilla.com/D138007

dom/html/TextControlState.cpp

@@ -34,6 +34,7 @@
 #include "nsIScrollableFrame.h"
 #include "mozilla/AutoRestore.h"
 #include "mozilla/InputEventOptions.h"
+#include "mozilla/NativeKeyBindingsType.h"
 #include "mozilla/PresShell.h"
 #include "mozilla/TextEvents.h"
 #include "mozilla/dom/Event.h"
@@ -1004,10 +1005,10 @@ TextInputListener::HandleEvent(Event* aEvent) {
       return false;
     }
 
-    nsIWidget::NativeKeyBindingsType nativeKeyBindingsType =
+    NativeKeyBindingsType nativeKeyBindingsType =
         aTextControlElement.IsTextArea()
-            ? nsIWidget::NativeKeyBindingsForMultiLineEditor
-            : nsIWidget::NativeKeyBindingsForSingleLineEditor;
+            ? NativeKeyBindingsType::MultiLineEditor
+            : NativeKeyBindingsType::SingleLineEditor;
 
     nsIWidget* widget = widgetKeyEvent->mWidget;
     // If the event is created by chrome script, the widget is nullptr.