Move WebMouseEvent into its own header file.

chrome/browser/android/vr_shell/vr_input_manager.h

 // Copyright 2016 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 CHROME_BROWSER_ANDROID_VR_SHELL_VR_INPUT_MANAGER_H_
 #define CHROME_BROWSER_ANDROID_VR_SHELL_VR_INPUT_MANAGER_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "third_party/WebKit/public/platform/WebGestureEvent.h"
 #include "third_party/WebKit/public/platform/WebInputEvent.h"
+#include "third_party/WebKit/public/platform/WebMouseEvent.h"
 
 namespace content {
 class WebContents;
 }
 
 namespace vr_shell {
 
 // Note: This class is not thread safe and must only be used from main thread.
 class VrInputManager {
  public:
@@ skipping 11 matching lines @@
   content::WebContents* web_contents_;
 
   base::WeakPtrFactory<VrInputManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VrInputManager);
 };
 
 }  // namespace vr_shell
 
 #endif  // CHROME_BROWSER_ANDROID_VR_SHELL_VR_INPUT_MANAGER_H_