Moves RenderProcessHostImpl::init_time() to RenderProcessHost to fix broken test.

content/browser/renderer_host/render_process_host_impl.h

Index: content/browser/renderer_host/render_process_host_impl.h
diff --git a/content/browser/renderer_host/render_process_host_impl.h b/content/browser/renderer_host/render_process_host_impl.h
index 4a679aa2d23ecc865ad4b52640b79c7847051543..ecec4a92b56abf6aae1f8ecd0a970cc3c59996e7 100644
--- a/content/browser/renderer_host/render_process_host_impl.h
+++ b/content/browser/renderer_host/render_process_host_impl.h
@@ -139,6 +139,8 @@ class CONTENT_EXPORT RenderProcessHostImpl
       override;
   virtual void NotifyTimezoneChange() override;
   virtual ServiceRegistry* GetServiceRegistry() override;
+  virtual const base::TimeTicks& init_time() const override;
+
 
   // IPC::Sender via RenderProcessHost.
   virtual bool Send(IPC::Message* msg) override;
@@ -256,13 +258,6 @@ class CONTENT_EXPORT RenderProcessHostImpl
   // immediately after receiving response headers.
   void ResumeResponseDeferredAtStart(const GlobalRequestID& request_id);
 
-  // PlzNavigate
-  // Returns the time the first call to Init completed successfully (after a new
-  // renderer process was created); further calls to Init won't change this
-  // value.
-  // Note: Will disappear after PlzNavitate is completed.
-  const base::TimeTicks& init_time() const { return init_time_; }
-
  protected:
   // A proxy for our IPC::Channel that lives on the IO thread (see
   // browser_process.h)