PlzNavigate: Fix crash when loading unreachable URL.

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index cb9e3d3faa5df2dc38de129057f07c3d243797bb..c80a791e32d1baff32eafb894fa4bb235b206db3 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -4878,9 +4878,8 @@ void RenderFrameImpl::OnFailedNavigation(
       frame_->isViewSourceModeEnabled());
   SendFailedProvisionalLoad(failed_request, error, frame_);
 
-  // This check should have been done on the browser side already.
   if (!ShouldDisplayErrorPageForFailedLoad(error_code, common_params.url)) {
-    NOTREACHED();
+    didStopLoading();

[clamy, 2016/08/17 13:17:06]

We should send the IPC directly, as this is more of acommunication issue with
the renderer than something coming from blink.

Also add a comment like:
// The browser expects this frame to be loading an error page. Inform it that
the load stopped.

[arthursonzogni, 2016/08/17 13:45:09]

Done.

     return;
   }