net: plumb DnsRRResolver from IOThread to HttpNetworkSession.

chrome/browser/net/chrome_url_request_context.cc

Index: chrome/browser/net/chrome_url_request_context.cc
diff --git a/chrome/browser/net/chrome_url_request_context.cc b/chrome/browser/net/chrome_url_request_context.cc
index 58191488cea698dc6f1f2958dae229b4a16cc5e8..79a29c100012ee5b8586275964245848c3f7fb4b 100644
--- a/chrome/browser/net/chrome_url_request_context.cc
+++ b/chrome/browser/net/chrome_url_request_context.cc
@@ -272,6 +272,7 @@ ChromeURLRequestContext* FactoryForOriginal::Create() {
       ChromeThread::GetMessageLoopProxyForThread(ChromeThread::CACHE));
   net::HttpCache* cache =
       new net::HttpCache(context->host_resolver(),
+                         context->dnsrr_resolver(),
                          context->proxy_service(),
                          context->ssl_config_service(),
                          context->http_auth_handler_factory(),
@@ -404,6 +405,7 @@ ChromeURLRequestContext* FactoryForOffTheRecord::Create() {
 
   net::HttpCache* cache =
       new net::HttpCache(context->host_resolver(),
+                         context->dnsrr_resolver(),
                          context->proxy_service(),
                          context->ssl_config_service(),
                          context->http_auth_handler_factory(),
@@ -499,6 +501,7 @@ ChromeURLRequestContext* FactoryForMedia::Create() {
     // If original HttpCache doesn't exist, simply construct one with a whole
     // new set of network stack.
     cache = new net::HttpCache(main_context->host_resolver(),
+                               main_context->dnsrr_resolver(),
                                main_context->proxy_service(),
                                main_context->ssl_config_service(),
                                main_context->http_auth_handler_factory(),