Revert "Use system skia for WebView."

This CL was causing some build failures in klp-modular-dev and
klp-volantis-dev.  Reverting while we investigate.

This reverts commit 63baaa137ed8bfe0b24385a0e1c944cd3dd811bd.

Change-Id: Ib3c84431ee294efbb243387afde820ca33082186
321 files changed