Update audio code to use size_t more correctly, webrtc/modules/ portion.

webrtc/modules/audio_conference_mixer/source/audio_frame_manipulator.cc

Index: webrtc/modules/audio_conference_mixer/source/audio_frame_manipulator.cc
diff --git a/webrtc/modules/audio_conference_mixer/source/audio_frame_manipulator.cc b/webrtc/modules/audio_conference_mixer/source/audio_frame_manipulator.cc
index 3dce5c8bea68e787ede99a067e8af9298adff8f2..636698e9c10fc9da63c0f41583d043b88bee7e7b 100644
--- a/webrtc/modules/audio_conference_mixer/source/audio_frame_manipulator.cc
+++ b/webrtc/modules/audio_conference_mixer/source/audio_frame_manipulator.cc
@@ -35,14 +35,14 @@ const float rampArray[] = {0.0000f, 0.0127f, 0.0253f, 0.0380f,
                            0.8608f, 0.8734f, 0.8861f, 0.8987f,
                            0.9114f, 0.9241f, 0.9367f, 0.9494f,
                            0.9620f, 0.9747f, 0.9873f, 1.0000f};
-const int rampSize = sizeof(rampArray)/sizeof(rampArray[0]);
+const size_t rampSize = sizeof(rampArray)/sizeof(rampArray[0]);
 }  // namespace
 
 namespace webrtc {
 void CalculateEnergy(AudioFrame& audioFrame)
 {
     audioFrame.energy_ = 0;
-    for(int position = 0; position < audioFrame.samples_per_channel_;
+    for(size_t position = 0; position < audioFrame.samples_per_channel_;
         position++)
     {
         // TODO(andrew): this can easily overflow.
@@ -54,7 +54,7 @@ void CalculateEnergy(AudioFrame& audioFrame)
 void RampIn(AudioFrame& audioFrame)
 {
     assert(rampSize <= audioFrame.samples_per_channel_);
-    for(int i = 0; i < rampSize; i++)
+    for(size_t i = 0; i < rampSize; i++)
     {
         audioFrame.data_[i] = static_cast<int16_t>(rampArray[i] *
                                                    audioFrame.data_[i]);
@@ -64,9 +64,9 @@ void RampIn(AudioFrame& audioFrame)
 void RampOut(AudioFrame& audioFrame)
 {
     assert(rampSize <= audioFrame.samples_per_channel_);
-    for(int i = 0; i < rampSize; i++)
+    for(size_t i = 0; i < rampSize; i++)
     {
-        const int rampPos = rampSize - 1 - i;
+        const size_t rampPos = rampSize - 1 - i;
         audioFrame.data_[i] = static_cast<int16_t>(rampArray[rampPos] *
                                                    audioFrame.data_[i]);
     }