Ensure capture_levels_ is sized correctly at init time.

Fixes failing voe_auto_test and audioproc_perf.

TBR=bjornv

Review URL: https://webrtc-codereview.appspot.com/6699004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5348 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/audio_processing/gain_control_impl.cc

@@ -302,6 +302,7 @@ int GainControlImpl::Initialize() {
     return err;
   }
 
+  capture_levels_.assign(num_handles(), analog_capture_level_);
   return apm_->kNoError;
 }