base/testutils.h: Use namespace webrtc::testing instead of plain testing

webrtc/base/httpserver_unittest.cc

 /*
  *  Copyright 2007 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #include "webrtc/base/gunit.h"
 #include "webrtc/base/httpserver.h"
 #include "webrtc/base/testutils.h"
 
-using namespace testing;
+using namespace webrtc::testing;
 
 namespace rtc {
 
 namespace {
   const char* const kRequest =
     "GET /index.html HTTP/1.1\r\n"
     "Host: localhost\r\n"
     "\r\n";
 
   struct HttpServerMonitor : public sigslot::has_slots<> {
@@ skipping 95 matching lines @@
   // Add an active client connection
   CreateClientConnection(server, monitor, true);
   // Initiate a forceful close
   server.CloseAll(true);
   // Connections have all closed
   EXPECT_TRUE(monitor.server_closed);
   EXPECT_TRUE(monitor.connection_closed);
 }
 
 } // namespace rtc