Enforce marking "override" for functions overriding Blink.

android_webview/renderer/aw_content_settings_client.h

Index: android_webview/renderer/aw_content_settings_client.h
diff --git a/android_webview/renderer/aw_content_settings_client.h b/android_webview/renderer/aw_content_settings_client.h
index 5d44551858ea8d80d386dc1411c27eae045789ca..90a947941bb8d71c4b8ead4ef254d2f1c7f71d68 100644
--- a/android_webview/renderer/aw_content_settings_client.h
+++ b/android_webview/renderer/aw_content_settings_client.h
@@ -20,14 +20,14 @@ class AwContentSettingsClient : public content::RenderFrameObserver,
   ~AwContentSettingsClient() override;
 
   // blink::WebContentSettingsClient implementation.
-  virtual bool allowDisplayingInsecureContent(
+  bool allowDisplayingInsecureContent(
       bool enabled_per_settings,
       const blink::WebSecurityOrigin& origin,
-      const blink::WebURL& url);
-  virtual bool allowRunningInsecureContent(
+      const blink::WebURL& url) override;
+  bool allowRunningInsecureContent(
       bool enabled_per_settings,
       const blink::WebSecurityOrigin& origin,
-      const blink::WebURL& url);
+      const blink::WebURL& url) override;
 
   DISALLOW_COPY_AND_ASSIGN(AwContentSettingsClient);
 };