Use size_t more consistently for packet/payload lengths.

See design doc at https://docs.google.com/a/chromium.org/document/d/1I6nmE9D_BmCY-IoV6MDPY2V6WYpEI-dg2apWXTfZyUI/edit?usp=sharing for more information.

This CL was reviewed and approved in pieces in the following CLs:
https://webrtc-codereview.appspot.com/24209004/
https://webrtc-codereview.appspot.com/24229004/
https://webrtc-codereview.appspot.com/24259004/
https://webrtc-codereview.appspot.com/25109004/
https://webrtc-codereview.appspot.com/26099004/
https://webrtc-codereview.appspot.com/27069004/
https://webrtc-codereview.appspot.com/27969004/
https://webrtc-codereview.appspot.com/27989004/
https://webrtc-codereview.appspot.com/29009004/
https://webrtc-codereview.appspot.com/30929004/
https://webrtc-codereview.appspot.com/30939004/
https://webrtc-codereview.appspot.com/31999004/
Committing as TBR to the original reviewers.

BUG=chromium:81439
TEST=none
TBR=pthatcher,henrik.lundin,tina.legrand,stefan,tkchin,glaznev,kjellander,perkj,mflodman,henrika,asapersson,niklas.enbom

Review URL: https://webrtc-codereview.appspot.com/23129004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7726 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/modules/video_coding/main/source/packet.h b/webrtc/modules/video_coding/main/source/packet.h
index 242d3a4..d98b6f6 100644
--- a/webrtc/modules/video_coding/main/source/packet.h
+++ b/webrtc/modules/video_coding/main/source/packet.h
@@ -21,10 +21,10 @@
 public:
     VCMPacket();
     VCMPacket(const uint8_t* ptr,
-              const uint32_t size,
+              const size_t size,
               const WebRtcRTPHeader& rtpHeader);
     VCMPacket(const uint8_t* ptr,
-              uint32_t size,
+              size_t size,
               uint16_t seqNum,
               uint32_t timestamp,
               bool markerBit);
@@ -37,7 +37,7 @@
     int64_t ntp_time_ms_;
     uint16_t          seqNum;
     const uint8_t*    dataPtr;
-    uint32_t          sizeBytes;
+    size_t          sizeBytes;
     bool                    markerBit;
 
     FrameType               frameType;