Added namespaces in the newly C++ified AEC code

webrtc/modules/audio_processing/aec/aec_resampler.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.
  */
 
 /* Resamples a signal to an arbitrary rate. Used by the AEC to compensate for
  * clock skew by resampling the farend signal.
  */
 
 #include "webrtc/modules/audio_processing/aec/aec_resampler.h"
 
 #include <assert.h>
 #include <math.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include "webrtc/modules/audio_processing/aec/aec_core.h"
 
+namespace webrtc {
+
 enum { kEstimateLengthFrames = 400 };
 
 typedef struct {
   float buffer[kResamplerBufferSize];
   float position;
 
   int deviceSampleRateHz;
   int skewData[kEstimateLengthFrames];
   int skewDataIndex;
   float skewEstimate;
@@ skipping 161 matching lines @@
   xAvg = x / n;
   denom = x2 - xAvg * x;
 
   if (denom != 0) {
     skew = (xy - xAvg * y) / denom;
   }
 
   *skewEst = skew;
   return 0;
 }
+}  // namespace webrtc