Rename Audio[Multi]Vector.CopyFrom to .CopyTo

The name of the copy method was confusing. This change makes the
code easier to read where the method is used.

R=kwiberg@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/25389004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7059 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/audio_coding/neteq/audio_vector.cc

@@ -22,7 +22,7 @@ void AudioVector::Clear() {
   first_free_ix_ = 0;
 }
 
-void AudioVector::CopyFrom(AudioVector* copy_to) const {
+void AudioVector::CopyTo(AudioVector* copy_to) const {
   if (copy_to) {
     copy_to->Reserve(Size());
     assert(copy_to->capacity_ >= Size());