Enable cpplint and fix cpplint errors in webrtc/*audio

webrtc/common_audio/vad/vad_unittest.h

Index: webrtc/common_audio/vad/vad_unittest.h
diff --git a/webrtc/common_audio/vad/vad_unittest.h b/webrtc/common_audio/vad/vad_unittest.h
index 55ba5271f320f4a1194d7ec0a0785714129f346c..7edf58557121dc8dac08800d2a81b9e716dd80b2 100644
--- a/webrtc/common_audio/vad/vad_unittest.h
+++ b/webrtc/common_audio/vad/vad_unittest.h
@@ -8,15 +8,16 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#ifndef WEBRTC_COMMON_AUDIO_VAD_VAD_UNITTEST_H
-#define WEBRTC_COMMON_AUDIO_VAD_VAD_UNITTEST_H
+#ifndef WEBRTC_COMMON_AUDIO_VAD_VAD_UNITTEST_H_
+#define WEBRTC_COMMON_AUDIO_VAD_VAD_UNITTEST_H_
 
 #include <stddef.h>  // size_t
 
 #include "webrtc/test/gtest.h"
 #include "webrtc/typedefs.h"
 
-namespace {
+namespace webrtc {
+namespace test {
 
 // Modes we support
 const int kModes[] = { 0, 1, 2, 3 };
@@ -32,7 +33,8 @@ const size_t kFrameLengths[] = { 80, 120, 160, 240, 320, 480, 640, 960,
     kMaxFrameLength };
 const size_t kFrameLengthsSize = sizeof(kFrameLengths) / sizeof(*kFrameLengths);
 
-}  // namespace
+}  // namespace test
+}  // namespace webrtc
 
 class VadTest : public ::testing::Test {
  protected:
@@ -44,4 +46,4 @@ class VadTest : public ::testing::Test {
   bool ValidRatesAndFrameLengths(int rate, size_t frame_length);
 };
 
-#endif  // WEBRTC_COMMON_AUDIO_VAD_VAD_UNITTEST_H
+#endif  // WEBRTC_COMMON_AUDIO_VAD_VAD_UNITTEST_H_