make NavigationGesture part of public content API and use it outside content

content/renderer/render_view_impl.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 CONTENT_RENDERER_RENDER_VIEW_IMPL_H_
 #define CONTENT_RENDERER_RENDER_VIEW_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 10 matching lines @@
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "base/process/process.h"
 #include "base/strings/string16.h"
 #include "base/timer/timer.h"
 #include "build/build_config.h"
 #include "cc/input/browser_controls_state.h"
 #include "cc/resources/shared_bitmap.h"
 #include "content/common/content_export.h"
 #include "content/common/frame_message_enums.h"
-#include "content/common/navigation_gesture.h"
 #include "content/common/page_message_enums.h"
 #include "content/common/view_message_enums.h"
 #include "content/public/common/browser_controls_state.h"
 #include "content/public/common/drop_data.h"
+#include "content/public/common/navigation_gesture.h"
 #include "content/public/common/page_zoom.h"
 #include "content/public/common/referrer.h"
 #include "content/public/common/renderer_preferences.h"
 #include "content/public/common/web_preferences.h"
 #include "content/public/renderer/render_view.h"
 #include "content/renderer/render_frame_impl.h"
 #include "content/renderer/render_widget.h"
 #include "content/renderer/render_widget_owner_delegate.h"
 #include "content/renderer/stats_collection_observer.h"
 #include "ipc/ipc_platform_file.h"
@@ skipping 793 matching lines @@
   // use the Observer interface to filter IPC messages and receive frame change
   // notifications.
   // ---------------------------------------------------------------------------
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_VIEW_IMPL_H_