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

chrome/browser/chrome_content_browser_client.h

Index: chrome/browser/chrome_content_browser_client.h
diff --git a/chrome/browser/chrome_content_browser_client.h b/chrome/browser/chrome_content_browser_client.h
index 27580ff6010fd3b3a83fd9e31db6aea8fe092028..f938d829eaa2988bef4449dea71fcd3a9e3a648f 100644
--- a/chrome/browser/chrome_content_browser_client.h
+++ b/chrome/browser/chrome_content_browser_client.h
@@ -257,6 +257,15 @@ class ChromeContentBrowserClient : public content::ContentBrowserClient {
   void OverridePageVisibilityState(
       content::RenderFrameHost* render_frame_host,
       blink::WebPageVisibilityState* visibility_state) override;
+  bool ShouldAllowDisplayingInsecureContent(
+      bool allowed_per_settings,
+      const GURL& resource_url,
+      content::WebContents* web_contents) override;
+  bool ShouldAllowRunningInsecureContent(
+      bool allowed_per_settings,
+      const url::Origin& origin,
+      const GURL& resource_url,
+      content::WebContents* web_contents) override;
 
 #if defined(OS_ANDROID)
   void GetAdditionalMappedFilesForChildProcess(