AU: Make proxy resolution asynchronous.

libcurl_http_fetcher.h

Index: libcurl_http_fetcher.h
diff --git a/libcurl_http_fetcher.h b/libcurl_http_fetcher.h
index c5f784b05e637ecc65f62bc1e5d454f700fc11c0..177664bc8c80b93f5b27d3e7d225510803eab10a 100644
--- a/libcurl_http_fetcher.h
+++ b/libcurl_http_fetcher.h
@@ -91,6 +91,10 @@ class LibcurlHttpFetcher : public HttpFetcher {
   }
 
  private:
+  // Callback for when proxy resolution has completed. This begins the
+  // transfer.
+  void ProxiesResolved();
+   
   // Asks libcurl for the http response code and stores it in the object.
   void GetHttpResponseCode();