Add a force pipelining option to load flags.

chrome/browser/net/http_pipelining_compatibility_client.h

Index: chrome/browser/net/http_pipelining_compatibility_client.h
diff --git a/chrome/browser/net/http_pipelining_compatibility_client.h b/chrome/browser/net/http_pipelining_compatibility_client.h
index 1931b8ca1c20a990bec9f1377e8e3815a031dea4..023a35b12d524f1737bd47b58196a465aba0e847 100644
--- a/chrome/browser/net/http_pipelining_compatibility_client.h
+++ b/chrome/browser/net/http_pipelining_compatibility_client.h
@@ -13,6 +13,7 @@
 #include "net/base/completion_callback.h"
 #include "net/base/io_buffer.h"
 #include "net/url_request/url_request.h"
+#include "net/url_request/url_request_context.h"
 
 namespace chrome_browser_net {
 
@@ -118,6 +119,8 @@ class HttpPipeliningCompatibilityClient {
   ScopedVector<Request> requests_;
   net::CompletionCallback finished_callback_;
   size_t num_finished_;
+  scoped_ptr<net::HttpTransactionFactory> http_transaction_factory_;
+  scoped_refptr<net::URLRequestContext> url_request_context_;
 };
 
 }  // namespace chrome_browser_net