Add an async method to QuicChromiumClientSession::Handle for

net/quic/chromium/quic_http_stream.h

Index: net/quic/chromium/quic_http_stream.h
diff --git a/net/quic/chromium/quic_http_stream.h b/net/quic/chromium/quic_http_stream.h
index f9f887aaf37e5394eff1b59e73199f2f07032253..9add684073764418c27f6aafcfe487e7bd78ddc8 100644
--- a/net/quic/chromium/quic_http_stream.h
+++ b/net/quic/chromium/quic_http_stream.h
@@ -35,9 +35,7 @@ class QuicHttpStreamPeer;
 // The QuicHttpStream is a QUIC-specific HttpStream subclass.  It holds a
 // non-owning pointer to a QuicChromiumClientStream which it uses to
 // send and receive data.
-class NET_EXPORT_PRIVATE QuicHttpStream
-    : public QuicClientPushPromiseIndex::Delegate,
-      public MultiplexedHttpStream {
+class NET_EXPORT_PRIVATE QuicHttpStream : public MultiplexedHttpStream {
  public:
   explicit QuicHttpStream(
       std::unique_ptr<QuicChromiumClientSession::Handle> session);
@@ -67,15 +65,6 @@ class NET_EXPORT_PRIVATE QuicHttpStream
   void PopulateNetErrorDetails(NetErrorDetails* details) override;
   void SetPriority(RequestPriority priority) override;
 
-  // QuicClientPushPromiseIndex::Delegate implementation
-  bool CheckVary(const SpdyHeaderBlock& client_request,
-                 const SpdyHeaderBlock& promise_request,
-                 const SpdyHeaderBlock& promise_response) override;
-  // TODO(rch): QuicClientPushPromiseIndex::Delegate is part of shared code.
-  // Figure out how to make the QuicHttpStream receive a Handle in this
-  // case instead of a QuicSpdyStream.
-  void OnRendezvousResult(QuicSpdyStream* stream) override;
-
   static HttpResponseInfo::ConnectionInfo ConnectionInfoFromQuicVersion(
       QuicVersion quic_version);
 
@@ -217,11 +206,6 @@ class NET_EXPORT_PRIVATE QuicHttpStream
   int session_error_;  // Error code from the connection shutdown.
 
   bool found_promise_;
-  // |QuicClientPromisedInfo| owns this. It will be set when |Try()|
-  // is asynchronous, i.e. it returned QUIC_PENDING, and remains valid
-  // until |OnRendezvouResult()| fires or |push_handle_->Cancel()| is
-  // invoked.
-  QuicClientPushPromiseIndex::TryHandle* push_handle_;
 
   // Set to true when DoLoop() is being executed, false otherwise.
   bool in_loop_;