PlzNavigate: Fix for the PhishingDOMFeatureExtractorTest.SubFrames and SubframeRemoval tests

chrome/renderer/chrome_mock_render_thread.h

Index: chrome/renderer/chrome_mock_render_thread.h
diff --git a/chrome/renderer/chrome_mock_render_thread.h b/chrome/renderer/chrome_mock_render_thread.h
index ffb1e9c9fb4ef68ddcf9d6dc3a29c12f0f04daf4..bc7901e4c8815345c2cfd05f29908a707a3689db 100644
--- a/chrome/renderer/chrome_mock_render_thread.h
+++ b/chrome/renderer/chrome_mock_render_thread.h
@@ -27,11 +27,12 @@ class ChromeMockRenderThread : public content::MockRenderThread {
   void set_io_task_runner(
       const scoped_refptr<base::SingleThreadTaskRunner>& task_runner);
 
- private:
+ protected:
   // Overrides base class implementation to add custom handling for
   // print and extensions.
   bool OnMessageReceived(const IPC::Message& msg) override;
 
+ private:
 #if defined(ENABLE_EXTENSIONS)
   // The callee expects to be returned a valid channel_id.
   void OnOpenChannelToExtension(int routing_id,