Update from chromium https://crrev.com/301315

This updates from chromium commit
060d7dc875cc41f46ab264181d1d622d02c3c8b7 aka commit position 301315. The
following changes from earlier rolls are included:

*) Remove gpu_media.patch, no longer needed thanks to
  https://crrev.com/301048
*) Added skia_build.patch to resolve blink dependency added by
  https://crrev.com/301105
*) Applied mojo changes for https://crrev.com/301165

TBR=ben@chromium.org

Review URL: https://codereview.chromium.org/681713002