Pass request context and frame type down to Blink for redirect responses.

We're currently not passing the request context or frame type correctly
when performing redirects, which breaks our mixed content checking
functionality for those requests. This is the Chromium side of a fix.
Blink side to follow.

BUG=417841

Review URL: https://codereview.chromium.org/605103003

Cr-Commit-Position: refs/heads/master@{#297104}

content/child/web_url_loader_impl.cc

@@ -486,6 +486,8 @@ bool WebURLLoaderImpl::Context::OnReceivedRedirect(
   new_request.setFirstPartyForCookies(
       redirect_info.new_first_party_for_cookies);
   new_request.setDownloadToFile(request_.downloadToFile());
+  new_request.setRequestContext(request_.requestContext());
+  new_request.setFrameType(request_.frameType());
 
   new_request.setHTTPReferrer(WebString::fromUTF8(redirect_info.new_referrer),
                               referrer_policy_);