Eliminate ScopedRTLFlipCanvas.

Instead, expose a flipping method on ScopedCanvas.

Bug: none
Change-Id: I53f40aa1448dff3641966f837325a153b5baec98
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1670391
Reviewed-by: Michael Wasserman <msw@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#672272}
5 files changed