Enable the -Wundef warning for clang

webrtc/call/bitrate_allocator_unittest.cc

 /*
  *  Copyright (c) 2012 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 <algorithm>
 #include <memory>
 #include <vector>
 
-#include "testing/gmock/include/gmock/gmock.h"
-#include "testing/gtest/include/gtest/gtest.h"
+#include "webrtc/test/gmock.h"
+#include "webrtc/test/gtest.h"
 #include "webrtc/call/bitrate_allocator.h"
 #include "webrtc/modules/bitrate_controller/include/bitrate_controller.h"
 
 using testing::NiceMock;
 
 namespace webrtc {
 
 class MockLimitObserver : public BitrateAllocator::LimitObserver {
  public:
   MOCK_METHOD2(OnAllocationLimitsChanged,
@@ skipping 465 matching lines @@
   allocator_->OnNetworkChanged(330000, 0, 50);
   EXPECT_EQ(330000u, observer.last_bitrate_bps_);
 
   allocator_->OnNetworkChanged(300000, 0, 50);
   EXPECT_EQ(300000u, observer.last_bitrate_bps_);
 
   allocator_->RemoveObserver(&observer);
 }
 
 }  // namespace webrtc