Revert "Reland "Respect canvas size and frame offset in webp decoder""

Revert "Reland "Respect canvas size and frame offset in webp decoder""

This reverts commit 604971e39a20392fd4c74a56bcdc187311cf86dc.

Reason for revert: Strange vk failures

Original change's description:
> Reland "Respect canvas size and frame offset in webp decoder"
>
> Original Change Reviewed At:
> https://skia-review.googlesource.com/c/7800
>
> CQ_INCLUDE_TRYBOTS=skia.primary:Test-Ubuntu-Clang-GCE-CPU-AVX2-x86_64-Debug-MSAN
>
> BUG=skia:6185
>
> Change-Id: I92baa9070e15ef3c62dd347c08c906c2715dda10
> Reviewed-on: https://skia-review.googlesource.com/8050
> Reviewed-by: Matt Sarett <msarett@google.com>
> Commit-Queue: Matt Sarett <msarett@google.com>
>

TBR=msarett@google.com,reviews@skia.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:6185
CQ_INCLUDE_TRYBOTS=skia.primary:Test-Ubuntu-Clang-GCE-CPU-AVX2-x86_64-Debug-MSAN

Change-Id: Ice93b62c55ea13fce83140567be16225ff0e2fdb
Reviewed-on: https://skia-review.googlesource.com/8123
Commit-Queue: Matt Sarett <msarett@google.com>
Reviewed-by: Matt Sarett <msarett@google.com>