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/webrtc@7726 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/video_frame.h b/video_frame.h
index f76b9af..2c753b9 100644
--- a/video_frame.h
+++ b/video_frame.h
@@ -189,7 +189,7 @@
         _size(0),
         _completeFrame(false) {}
 
-  EncodedImage(uint8_t* buffer, uint32_t length, uint32_t size)
+  EncodedImage(uint8_t* buffer, size_t length, size_t size)
       : _encodedWidth(0),
         _encodedHeight(0),
         _timeStamp(0),
@@ -209,8 +209,8 @@
   int64_t capture_time_ms_;
   VideoFrameType _frameType;
   uint8_t* _buffer;
-  uint32_t _length;
-  uint32_t _size;
+  size_t _length;
+  size_t _size;
   bool _completeFrame;
 };