Revert of cc: Add mailbox support to ResourceProvider write locks. (patchset #5 id:70001 of https://codereview.chromium.org/2081883002/ )

Reason for revert:
Causing canvas crashes - bug 623101

Original issue's description:
> Reland of cc: Add mailbox support to ResourceProvider write locks. (patchset #24 id:460001 of https://codereview.chromium.org/1951193002/ )
>
> Original issue's description:
> > cc: Add mailbox support to ResourceProvider write locks.
> >
> > This adds support for mailboxes to ScopedWriteLockGL. Using the mailbox
> > requires using ScopedTextureProvider/ScopedSkSurfaceProvider which
> > ensures that the texture id for the mailbox is destroyed after use on
> > the worker context.
> >
> > This CL also includes the following cleanup:
> > 1. ResourceProvider locks don't keep resource pointers around.
> > 2. ScopedSamplerGL does not inherit from ScopedReadLockGL.
> > 3. GpuRasterizer is folded back into GpuRasterBufferProvider.
> > 4. TileTaskManager does not own RasterBufferProvider.
> >
> > BUG=525259
> > R=piman@chromium.org
> > CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
> >
> > Committed: https://crrev.com/5fa5dbdf25bbec21b84f752d3f0642cd184467e2
> > Committed: https://crrev.com/3b0f0b8d3db0a9f66864d5b7da87c82f49e74a29
> > Cr-Original-Commit-Position: refs/heads/master@{#398204}
> > Cr-Commit-Position: refs/heads/master@{#399983}
>
> R=piman@chromium.org
> BUG=525259, 621422, 621130
> CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
>
> Committed: https://crrev.com/b3071e4aabd0cb1f29cd624e77eb5f40722be965
> Cr-Commit-Position: refs/heads/master@{#401717}

TBR=piman@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=525259, 621422, 621130

Review-Url: https://codereview.chromium.org/2106503002
Cr-Commit-Position: refs/heads/master@{#402290}
27 files changed