Revert "Change call-sites now that SkCanvas is not ref-counted"

This reverts commit 60c148ef13aed978fcaf5dae9e242f99618f2164.
https://codereview.chromium.org/2476113002/

BUG=666154
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_precise_blink_rel

TBR=esprehn@chromium.org,blundell@chromium.org,ccameron@chromium.org,danakj@chromium.org,fmalita@chromium.org,khushalsagar@chromium.org,raymes@chromium.org,sky@chromium.org,tobiasjs@chromium.org

Review-Url: https://codereview.chromium.org/2509983004
Cr-Commit-Position: refs/heads/master@{#433136}
49 files changed