Remove HTTP pipelining support.

net/http/http_response_body_drainer.h

Index: net/http/http_response_body_drainer.h
diff --git a/net/http/http_response_body_drainer.h b/net/http/http_response_body_drainer.h
index 284d08a99cd8c063402953d05400f45b38e1ae71..5c7713e254bb39ffce3a4c5bf87e513ee79c1f22 100644
--- a/net/http/http_response_body_drainer.h
+++ b/net/http/http_response_body_drainer.h
@@ -35,9 +35,6 @@ class NET_EXPORT_PRIVATE HttpResponseBodyDrainer {
   // doesn't complete immediately, it will add itself to |session|.
   void Start(HttpNetworkSession* session);
 
-  // As above, but stop reading once |num_bytes_to_drain| has been reached.
-  void StartWithSize(HttpNetworkSession* session, int num_bytes_to_drain);
-
  private:
   enum State {
     STATE_DRAIN_RESPONSE_BODY,
@@ -54,7 +51,6 @@ class NET_EXPORT_PRIVATE HttpResponseBodyDrainer {
   void OnTimerFired();
   void Finish(int result);
 
-  int read_size_;
   scoped_refptr<IOBuffer> read_buf_;
   const scoped_ptr<HttpStreamBase> stream_;
   State next_state_;