Enable QUIC's pacing by default on all QUIC connections by setting

net/tools/quic/end_to_end_test.cc

 // Copyright (c) 2012 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 <stddef.h>
 #include <string>
 #include <sys/epoll.h>
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 301 matching lines @@
                 client_->client()->session()->connection())),
         new ClientDelegate(client_->client()));
     return client_->client()->connected();
   }
 
   void SetUp() override {
     // The ownership of these gets transferred to the QuicPacketWriterWrapper
     // and TestWriterFactory when Initialize() is executed.
     client_writer_ = new PacketDroppingTestWriter();
     server_writer_ = new PacketDroppingTestWriter();
+    // TODO(ianswett): Remove this once it's fully rolled out.
+    FLAGS_quic_enable_pacing = false;
   }
 
   void TearDown() override { StopServer(); }
 
   void StartServer() {
     server_thread_.reset(
         new ServerThread(
             new QuicServer(server_config_, server_supported_versions_),
             server_address_,
             strike_register_no_startup_period_));
@@ skipping 1112 matching lines @@
     // Waits for up to 50 ms.
     client_->client()->WaitForEvents();
   }
   server_thread_->Resume();
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace tools
 }  // namespace net