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 2655b8516aaa9b00f93c828e3130d01a6cad129d..49ea4cde75b80a1fb743ad92a9b429d356f05365 100644
--- a/content/public/browser/web_contents.h
+++ b/content/public/browser/web_contents.h
@@ -596,6 +596,9 @@ 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);