bump revision to r62

BUG=none
TEST=none
Review URL: http://webrtc-codereview.appspot.com/275001

git-svn-id: http://libyuv.googlecode.com/svn/trunk@63 16f28f9a-4ce2-e073-06de-1de4eb20be90

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 48
+Version: 63
 License: BSD
 License File: LICENSE