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

content/public/browser/content_browser_client.cc

Index: content/public/browser/content_browser_client.cc
diff --git a/content/public/browser/content_browser_client.cc b/content/public/browser/content_browser_client.cc
index 53c4b2311ec3c938a5172868a20cd73de7ea28d2..d81266e400f7a52e279eeff410f67fdfeae6e508 100644
--- a/content/public/browser/content_browser_client.cc
+++ b/content/public/browser/content_browser_client.cc
@@ -118,6 +118,17 @@ std::unique_ptr<media::CdmFactory> ContentBrowserClient::CreateCdmFactory() {
   return nullptr;
 }
 
+void ContentBrowserClient::PassiveInsecureContentFound(
+    const GURL& resource_url) {}
+
+bool ContentBrowserClient::ShouldAllowRunningInsecureContent(
+    bool allowed_per_settings,
+    const url::Origin& origin,
+    const GURL& resource_url,
+    WebContents* web_contents) {
+  return false;
+}
+
 bool ContentBrowserClient::ShouldSwapProcessesForRedirect(
     BrowserContext* browser_context,
     const GURL& current_url,