Remove unused return value from QuicAlarm::Delegate::OnAlarm. No behavior change, not protected.

net/quic/quic_client_promised_info.cc

 // Copyright (c) 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/quic_client_promised_info.h"
 
 #include "base/logging.h"
 #include "net/quic/spdy_utils.h"
 
 using net::SpdyHeaderBlock;
 using net::kPushPromiseTimeoutSecs;
 
 namespace net {
 
 QuicClientPromisedInfo::QuicClientPromisedInfo(QuicClientSessionBase* session,
                                                QuicStreamId id,
                                                string url)
     : session_(session),
       helper_(session->connection()->helper()),
       id_(id),
       url_(url),
       client_request_delegate_(nullptr) {}
 
 QuicClientPromisedInfo::~QuicClientPromisedInfo() {}
 
-QuicTime QuicClientPromisedInfo::CleanupAlarm::OnAlarm() {
+void QuicClientPromisedInfo::CleanupAlarm::OnAlarm() {
   DVLOG(1) << "self GC alarm for stream " << promised_->id_;
   promised_->Reset(QUIC_STREAM_CANCELLED);
-  return QuicTime::Zero();
 }
 
 void QuicClientPromisedInfo::Init() {
   cleanup_alarm_.reset(
       helper_->CreateAlarm(new QuicClientPromisedInfo::CleanupAlarm(this)));
   cleanup_alarm_->Set(helper_->GetClock()->ApproximateNow().Add(
       QuicTime::Delta::FromSeconds(kPushPromiseTimeoutSecs)));
 }
 
 void QuicClientPromisedInfo::OnPromiseHeaders(const SpdyHeaderBlock& headers) {
@@ skipping 74 matching lines @@
   return FinalValidation();
 }
 
 void QuicClientPromisedInfo::Cancel() {
   // Don't fire OnRendezvousResult() for client initiated cancel.
   client_request_delegate_ = nullptr;
   Reset(QUIC_STREAM_CANCELLED);
 }
 
 }  // namespace net