Remove unnecessary 'virtual' annotation from mojo

mojo/services/html_viewer/webcookiejar_impl.h

 // Copyright 2014 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 MOJO_SERVICES_HTML_VIEWER_WEBCOOKIEJAR_IMPL_H_
 #define MOJO_SERVICES_HTML_VIEWER_WEBCOOKIEJAR_IMPL_H_
 
 #include "mojo/services/network/public/interfaces/cookie_store.mojom.h"
 #include "third_party/WebKit/public/platform/WebCookieJar.h"
 
 namespace html_viewer {
 
 class WebCookieJarImpl : public blink::WebCookieJar {
  public:
   explicit WebCookieJarImpl(mojo::CookieStorePtr store);
   virtual ~WebCookieJarImpl();
 
   // blink::WebCookieJar methods:
-  virtual void setCookie(
+  void setCookie(const blink::WebURL& url,
+                 const blink::WebURL& first_party_for_cookies,
+                 const blink::WebString& cookie) override;
+  blink::WebString cookies(
       const blink::WebURL& url,
-      const blink::WebURL& first_party_for_cookies,
-      const blink::WebString& cookie);
-  virtual blink::WebString cookies(
+      const blink::WebURL& first_party_for_cookies) override;
+  blink::WebString cookieRequestHeaderFieldValue(
       const blink::WebURL& url,
-      const blink::WebURL& first_party_for_cookies);
-  virtual blink::WebString cookieRequestHeaderFieldValue(
-      const blink::WebURL& url,
-      const blink::WebURL& first_party_for_cookies);
+      const blink::WebURL& first_party_for_cookies) override;
 
  private:
   mojo::CookieStorePtr store_;
   DISALLOW_COPY_AND_ASSIGN(WebCookieJarImpl);
 };
 
 }  // namespace html_viewer
 
 #endif  // MOJO_SERVICES_HTML_VIEWER_WEBCOOKIEJAR_IMPL_H_