Enable cpplint and fix cpplint errors in webrtc/*audio

webrtc/common_audio/vad/vad_core_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 <stdlib.h>
 
 #include "webrtc/common_audio/vad/vad_unittest.h"
 #include "webrtc/test/gtest.h"
 #include "webrtc/typedefs.h"
 
 extern "C" {
 #include "webrtc/common_audio/vad/vad_core.h"
 }
 
-namespace {
+namespace webrtc {
+namespace test {
 
 TEST_F(VadTest, InitCore) {
   // Test WebRtcVad_InitCore().
   VadInstT* self = reinterpret_cast<VadInstT*>(malloc(sizeof(VadInstT)));
 
   // null pointer test.
   EXPECT_EQ(-1, WebRtcVad_InitCore(nullptr));
 
   // Verify return = 0 for non-null pointer.
   EXPECT_EQ(0, WebRtcVad_InitCore(self));
@@ skipping 63 matching lines @@
     if (ValidRatesAndFrameLengths(32000, kFrameLengths[j])) {
       EXPECT_EQ(1, WebRtcVad_CalcVad32khz(self, speech, kFrameLengths[j]));
     }
     if (ValidRatesAndFrameLengths(48000, kFrameLengths[j])) {
       EXPECT_EQ(1, WebRtcVad_CalcVad48khz(self, speech, kFrameLengths[j]));
     }
   }
 
   free(self);
 }
-}  // namespace
+}  // namespace test
+}  // namespace webrtc