Enable cpplint and fix cpplint errors in webrtc/*audio

webrtc/common_audio/vad/vad_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.
  */
 
@@ skipping 34 matching lines @@
   } else if (rate == 48000) {
     if (frame_length == 480 || frame_length == 960 || frame_length == 1440) {
       return true;
     }
     return false;
   }
 
   return false;
 }
 
-namespace {
+namespace webrtc {
+namespace test {
 
 TEST_F(VadTest, ApiTest) {
   // This API test runs through the APIs for all possible valid and invalid
   // combinations.
 
   VadInst* handle = WebRtcVad_Create();
   int16_t zeros[kMaxFrameLength] = { 0 };
 
   // Construct a speech signal that will trigger the VAD in all modes. It is
   // known that (i * i) will wrap around, but that doesn't matter in this case.
@@ skipping 79 matching lines @@
       } else {
         EXPECT_EQ(-1, WebRtcVad_ValidRateAndFrameLength(kRates[i],
                                                         kFrameLengths[j]));
       }
     }
   }
 }
 
 // TODO(bjornv): Add a process test, run on file.
 
-}  // namespace
+}  // namespace test
+}  // namespace webrtc