Revert 7128 "Roll chromium_revision ea769fd..6455c69"

> Roll chromium_revision ea769fd..6455c69
> 
> Mainly to pick up https://codereview.chromium.org/552013004
> 
> Summary of changes (git diff ea769fd..6455c69 DEPS):
> * third_party/libvpx ceebbcc0..d95585f
> * third_party/swarming e7d8b98..14b5fd82
> * tools/gyp 1972:1973
> 
> R=pbos@webrtc.org
> 
> Review URL: https://webrtc-codereview.appspot.com/29379004

TBR=kjellander@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/27419004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7130 4adac7df-926f-26a2-2b94-8c16560cd09d