Remove unnecessary 'virtual' annotation from mojo

mojo/services/html_viewer/webmimeregistry_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_WEBMIMEREGISTRY_IMPL_H_
 #define MOJO_SERVICES_HTML_VIEWER_WEBMIMEREGISTRY_IMPL_H_
 
 #include "base/compiler_specific.h"
 #include "third_party/WebKit/public/platform/WebMimeRegistry.h"
 
 namespace html_viewer {
 
 class WebMimeRegistryImpl : public blink::WebMimeRegistry {
  public:
   WebMimeRegistryImpl() {}
   virtual ~WebMimeRegistryImpl() {}
 
   // WebMimeRegistry methods:
-  virtual blink::WebMimeRegistry::SupportsType supportsMIMEType(
-      const blink::WebString& mime_type);
-  virtual blink::WebMimeRegistry::SupportsType supportsImageMIMEType(
-      const blink::WebString& mime_type);
-  virtual blink::WebMimeRegistry::SupportsType supportsImagePrefixedMIMEType(
-      const blink::WebString& mime_type);
-  virtual blink::WebMimeRegistry::SupportsType supportsJavaScriptMIMEType(
-      const blink::WebString& mime_type);
-  virtual blink::WebMimeRegistry::SupportsType supportsMediaMIMEType(
+  blink::WebMimeRegistry::SupportsType supportsMIMEType(
+      const blink::WebString& mime_type) override;
+  blink::WebMimeRegistry::SupportsType supportsImageMIMEType(
+      const blink::WebString& mime_type) override;
+  blink::WebMimeRegistry::SupportsType supportsImagePrefixedMIMEType(
+      const blink::WebString& mime_type) override;
+  blink::WebMimeRegistry::SupportsType supportsJavaScriptMIMEType(
+      const blink::WebString& mime_type) override;
+  blink::WebMimeRegistry::SupportsType supportsMediaMIMEType(
       const blink::WebString& mime_type,
       const blink::WebString& codecs,
-      const blink::WebString& key_system);
-  virtual bool supportsMediaSourceMIMEType(
-      const blink::WebString& mime_type,
-      const blink::WebString& codecs);
-  virtual blink::WebMimeRegistry::SupportsType supportsNonImageMIMEType(
-      const blink::WebString& mime_type);
-  virtual blink::WebString mimeTypeForExtension(
-      const blink::WebString& extension);
-  virtual blink::WebString wellKnownMimeTypeForExtension(
-      const blink::WebString& extension);
-  virtual blink::WebString mimeTypeFromFile(
-      const blink::WebString& path);
+      const blink::WebString& key_system) override;
+  bool supportsMediaSourceMIMEType(const blink::WebString& mime_type,
+                                   const blink::WebString& codecs) override;
+  blink::WebMimeRegistry::SupportsType supportsNonImageMIMEType(
+      const blink::WebString& mime_type) override;
+  blink::WebString mimeTypeForExtension(
+      const blink::WebString& extension) override;
+  blink::WebString wellKnownMimeTypeForExtension(
+      const blink::WebString& extension) override;
+  blink::WebString mimeTypeFromFile(const blink::WebString& path) override;
 };
 
 }  // namespace html_viewer
 
 #endif  // MOJO_SERVICES_HTML_VIEWER_WEBMIMEREGISTRY_IMPL_H_