views: Remove unused/deprecated IsMouseEvent() function.

views/events/event_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 "views/events/event.h"
 
 #include <gdk/gdk.h>
 
 #include "base/logging.h"
 #include "ui/base/keycodes/keyboard_code_conversion_gtk.h"
@@ skipping 103 matching lines @@
     return gfx::Point(static_cast<int>(x), static_cast<int>(y));
   return gfx::Point();
 }
 
 ui::KeyboardCode KeyboardCodeFromNative(GdkEvent* gdk_event) {
   DCHECK(gdk_event->type == GDK_KEY_PRESS ||
          gdk_event->type == GDK_KEY_RELEASE);
   return ui::KeyboardCodeFromGdkEventKey(&gdk_event->key);
 }
 
-bool IsMouseEvent(GdkEvent* gdk_event) {
-  return gdk_event->type == GDK_MOTION_NOTIFY ||
-         gdk_event->type == GDK_BUTTON_PRESS ||
-         gdk_event->type == GDK_2BUTTON_PRESS ||
-         gdk_event->type == GDK_3BUTTON_PRESS ||
-         gdk_event->type == GDK_BUTTON_RELEASE;
-}
-
 int GetMouseWheelOffset(GdkEvent* gdk_event) {
   DCHECK(gdk_event->type == GDK_SCROLL);
   int offset = (gdk_event->scroll.direction == GDK_SCROLL_UP ||
                 gdk_event->scroll.direction == GDK_SCROLL_LEFT) ? 1 : -1;
   return offset;
 }
 
 }  // namespace
 
 namespace views {
@@ skipping 40 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // MouseWheelEvent, public:
 
 MouseWheelEvent::MouseWheelEvent(GdkEvent* gdk_event)
     : MouseEvent(gdk_event),
       offset_(kWheelDelta * GetMouseWheelOffset(gdk_event)) {
 }
 
 }  // namespace views