PlzNavigate: Move navigation-level mixed content checks to the browser.

content/browser/frame_host/render_frame_host_delegate.h

Index: content/browser/frame_host/render_frame_host_delegate.h
diff --git a/content/browser/frame_host/render_frame_host_delegate.h b/content/browser/frame_host/render_frame_host_delegate.h
index 998a687d8b08250b483c20bd94b5df641f1316d8..de3626adcba06dcd583a272b5299998188383c8a 100644
--- a/content/browser/frame_host/render_frame_host_delegate.h
+++ b/content/browser/frame_host/render_frame_host_delegate.h
@@ -213,6 +213,12 @@ class CONTENT_EXPORT RenderFrameHostDelegate {
   virtual std::unique_ptr<WebUIImpl> CreateWebUIForRenderFrameHost(
       const GURL& url);
 
+  // Notifies that mixed-content was displayed or ran within the container
+  // WebContents.
+  virtual void DidDisplayInsecureContent() {}
+  virtual void DidRunInsecureContent(const GURL& security_origin,
+                                     const GURL& target_url) {}
+
  protected:
   virtual ~RenderFrameHostDelegate() {}
 };