Move one CircularBuffer to webrtc::test namespace.

webrtc/modules/audio_coding/test/utility.cc

Index: webrtc/modules/audio_coding/test/utility.cc
diff --git a/webrtc/modules/audio_coding/test/utility.cc b/webrtc/modules/audio_coding/test/utility.cc
index 5c1fc3f968dc7e81af8fab9c954609a3794f533f..30bafd4a4913457c5eb06c5314a0e7f66dc28e5c 100644
--- a/webrtc/modules/audio_coding/test/utility.cc
+++ b/webrtc/modules/audio_coding/test/utility.cc
@@ -136,6 +136,8 @@ void PrintCodecs() {
 
 }
 
+namespace test {
+
 CircularBuffer::CircularBuffer(uint32_t len)
     : _buff(NULL),
       _idx(0),
@@ -265,6 +267,8 @@ int16_t CircularBuffer::Variance(double& var) {
   }
 }
 
+}  // namespace test
+
 bool FixedPayloadTypeCodec(const char* payloadName) {
   char fixPayloadTypeCodecs[NUM_CODECS_WITH_FIXED_PAYLOAD_TYPE][32] = { "PCMU",
       "PCMA", "GSM", "G723", "DVI4", "LPC", "PCMA", "G722", "QCELP", "CN",