This fixes 3 memory leaks:

1. Destroys local vulkan buffer collections.
2. Releases image2 resource in Scenic.
3. Deregister buffer collections from Scenic session.
Co-authored-by: NDavid Reveman <reveman@google.com>

This reverts commit a549c540.

Fixes https://github.com/flutter/flutter/issues/73937

https://skia.googlesource.com/skia.git/+log/84b0233bb38e..997df84ac144

2021-02-11 skia-autoroll@skia-public.iam.gserviceaccount.com Roll SwiftShader from 9677c6d28278 to 673a7fe5c3ff (5 revisions)
2021-02-11 reed@google.com Remove dead code for - non-sampling-optionsd drawImage (and drawAtlas, etc.) - drawBitmap calls
2021-02-11 mtklein@google.com add fast_mul(F32,F32)
2021-02-11 csmartdalton@google.com Remove shims for reordering indirect draw command signatures
2021-02-10 bsalomon@google.com Disable caching of GrTextures in promise images.

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-flutter-autoroll
Please CC borenet@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/master/autoroll/README.md