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

content/shell/browser/layout_test/layout_test_content_browser_client.cc

Index: content/shell/browser/layout_test/layout_test_content_browser_client.cc
diff --git a/content/shell/browser/layout_test/layout_test_content_browser_client.cc b/content/shell/browser/layout_test/layout_test_content_browser_client.cc
index f913fdbf38e2858cfb52a902fcf44fc55e6ecbe8..32e597aa47fbf46860f8556b291ff0b28fbea2ca 100644
--- a/content/shell/browser/layout_test/layout_test_content_browser_client.cc
+++ b/content/shell/browser/layout_test/layout_test_content_browser_client.cc
@@ -140,4 +140,18 @@ LayoutTestContentBrowserClient::GetPlatformNotificationService() {
   return layout_test_notification_manager_.get();
 }
 
+bool LayoutTestContentBrowserClient::ShouldAllowRunningInsecureContent(
+    bool allowed_per_settings,
+    const url::Origin& origin,
+    const GURL& resource_url,
+    content::WebContents* web_contents) {
+  const base::DictionaryValue& test_flags =
+      BlinkTestController::Get()
+          ->accumulated_layout_test_runtime_flags_changes();
+  bool allow_running = false;
+  test_flags.GetBoolean("running_insecure_content_allowed", &allow_running);
+
+  return allowed_per_settings || allow_running;
+}
+
 }  // namespace content