Fullscreen: make fullscreen requests come from RenderFrame

content/public/browser/web_contents.h

Index: content/public/browser/web_contents.h
diff --git a/content/public/browser/web_contents.h b/content/public/browser/web_contents.h
index 5478a378158c5dd4dcacfb8184555724693550dd..e3f3e698daf07871b6839e009846e9aac93e5a29 100644
--- a/content/public/browser/web_contents.h
+++ b/content/public/browser/web_contents.h
@@ -589,6 +589,9 @@ class WebContents : public PageNavigator,
   // Requests the Manifest of the main frame's document.
   virtual void GetManifest(const GetManifestCallback&) = 0;
 
+  // Requests the renderer to exit fullscreen.
+  virtual void ExitFullscreen() = 0;
+
 #if defined(OS_ANDROID)
   CONTENT_EXPORT static WebContents* FromJavaWebContents(
       jobject jweb_contents_android);