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 3b25ecdfb4454d3c340439efcc88621c22bcd668..b4c51a637df67e1f28299a1cccb76d8169f60555 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
@@ -133,4 +133,18 @@ 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