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

content/browser/web_contents/web_contents_impl.h

Index: content/browser/web_contents/web_contents_impl.h
diff --git a/content/browser/web_contents/web_contents_impl.h b/content/browser/web_contents/web_contents_impl.h
index 72e4b50cdbd0727418fbd6913c29e6bbc2e57e2c..867f6a40fa937a1a0b742d7e27839898cf19aaeb 100644
--- a/content/browser/web_contents/web_contents_impl.h
+++ b/content/browser/web_contents/web_contents_impl.h
@@ -507,6 +507,14 @@ class CONTENT_EXPORT WebContentsImpl
                          WindowOpenDisposition disposition,
                          const gfx::Rect& initial_rect,
                          bool user_gesture) override;
+  void DidDisplayInsecureContent() override;
+  void DidRunInsecureContent(const GURL& security_origin,
+                             const GURL& target_url) override;
+  void PassiveInsecureContentFound(const GURL& resource_url) override;
+  bool ShouldAllowRunningInsecureContent(content::WebContents* web_contents,
+                                         bool allowed_per_prefs,
+                                         const url::Origin& origin,
+                                         const GURL& resource_url) override;
 
   // RenderViewHostDelegate ----------------------------------------------------
   RenderViewHostDelegateView* GetDelegateView() override;