MacViews: Fix a forward declare of InputMethodDelegate in native_widget_private.h

ui/views/widget/native_widget_private.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_VIEWS_WIDGET_NATIVE_WIDGET_PRIVATE_H_
 #define UI_VIEWS_WIDGET_NATIVE_WIDGET_PRIVATE_H_
 
 #include "base/strings/string16.h"
 #include "ui/base/ui_base_types.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/views/widget/native_widget.h"
 
 namespace gfx {
 class FontList;
 class ImageSkia;
 class Rect;
 }
 
 namespace ui {
 class InputMethod;
 class NativeTheme;
 class OSExchangeData;
 }
 
 namespace views {
 class InputMethod;
-class InputMethodDelegate;
 class TooltipManager;
 namespace internal {
+class InputMethodDelegate;
 
 ////////////////////////////////////////////////////////////////////////////////
 // NativeWidgetPrivate interface
 //
 //  A NativeWidget subclass internal to views that provides Widget a conduit for
 //  communication with a backend-specific native widget implementation.
 //
 //  Many of the methods here are pass-thrus for Widget, and as such there is no
 //  documentation for them here. In that case, see methods of the same name in
 //  widget.h.
@@ skipping 192 matching lines @@
   virtual void RepostNativeEvent(gfx::NativeEvent native_event) = 0;
 
   // Overridden from NativeWidget:
   virtual internal::NativeWidgetPrivate* AsNativeWidgetPrivate() OVERRIDE;
 };
 
 }  // namespace internal
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_NATIVE_WIDGET_PRIVATE_H_