Avoid a NOT_REACHED() hit when we get an empty 404 page and

link doctor is down or disabled.

We weren't fully specifying WebURLError, which caused us to
be confused when looking up the strings for the error code.

We still don't have a nice error message for this, but at least
we don't DCHECK in debug and this will now at least cause the
local error page to say there was an http 404 error.

BUG=76457

Review URL: http://codereview.chromium.org/6995091

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@88543 0039d316-1c4b-4281-b951-d872f2087c98

content/renderer/render_view.cc

@@ -2634,6 +2634,8 @@ void RenderView::didFinishResourceLoad(
     const GURL& error_page_url = GetAlternateErrorPageURL(frame_url, HTTP_404);
     if (error_page_url.is_valid()) {
       WebURLError original_error;
+      original_error.domain = "http";
+      original_error.reason = 404;
       original_error.unreachableURL = frame_url;
 
       navigation_state->set_alt_error_page_fetcher(