Fix session_info_unittest error.

BUG=
TEST=

Review URL: http://webrtc-codereview.appspot.com/324009

git-svn-id: http://webrtc.googlecode.com/svn/trunk@1182 4adac7df-926f-26a2-2b94-8c16560cd09d

src/modules/video_coding/main/source/session_info.cc

@@ -636,6 +636,8 @@ int VCMSessionInfo::PrepareForDecode(uint8_t* frame_buffer) {
   }
   if (real_data_bytes == 0) {
     // Drop the frame since all it contains are zeros.
+    for (it = packets_.begin(); it != packets_.end(); ++it)
+      (*it).sizeBytes = 0;
     length = 0;
   }
   return length;