Get rid of Widget::ConvertPointFromAncestor.

ui/views/widget/native_widget_gtk.cc

 // Copyright (c) 2011 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.
 
 #include "ui/views/widget/native_widget_gtk.h"
 
 #include <X11/Xatom.h>
 #include <X11/Xlib.h>
 #include <X11/extensions/shape.h>
 #include <gdk/gdk.h>
@@ skipping 1325 matching lines @@
     return;
   }
   gtk_window_set_focus(GTK_WINDOW(GetNativeView()), NULL);
 }
 
 void NativeWidgetGtk::FocusNativeView(gfx::NativeView native_view) {
   if (native_view && !gtk_widget_is_focus(native_view))
     gtk_widget_grab_focus(native_view);
 }
 
-bool NativeWidgetGtk::ConvertPointFromAncestor(
-    const Widget* ancestor, gfx::Point* point) const {
-  NOTREACHED();
-  return false;
-}
-
 gfx::Rect NativeWidgetGtk::GetWorkAreaBoundsInScreen() const {
   return gfx::Screen::GetMonitorWorkAreaNearestWindow(GetNativeView());
 }
 
 void NativeWidgetGtk::SetInactiveRenderingDisabled(bool value) {
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // NativeWidgetGtk, protected:
 
@@ skipping 937 matching lines @@
     button_pressed = event->type == GDK_BUTTON_PRESS ||
         event->type == GDK_2BUTTON_PRESS ||
         event->type == GDK_3BUTTON_PRESS;
     gdk_event_free(event);
   }
   return button_pressed;
 }
 
 }  // namespace internal
 }  // namespace views