Remove unnecessary 'virtual' annotation from mojo

mojo/services/html_viewer/mojo_blink_platform_impl.h

Index: mojo/services/html_viewer/mojo_blink_platform_impl.h
diff --git a/mojo/services/html_viewer/mojo_blink_platform_impl.h b/mojo/services/html_viewer/mojo_blink_platform_impl.h
index af3dd754f994a29deb0850a2381a462ca1bf4a15..742ea98872c496eafa9792c898b3f138f26d90fe 100644
--- a/mojo/services/html_viewer/mojo_blink_platform_impl.h
+++ b/mojo/services/html_viewer/mojo_blink_platform_impl.h
@@ -21,12 +21,13 @@ class WebCookieJarImpl;
 class MojoBlinkPlatformImpl : public BlinkPlatformImpl {
  public:
   MojoBlinkPlatformImpl(mojo::ApplicationImpl* app);
-  virtual ~MojoBlinkPlatformImpl();
+  ~MojoBlinkPlatformImpl() override;
 
  private:
   // BlinkPlatform
   blink::WebCookieJar* cookieJar() override;
   blink::WebClipboard* clipboard() override;
+
   blink::WebURLLoader* createURLLoader() override;
   blink::WebSocketHandle* createWebSocketHandle() override;