Revert "Fix image info checking for always-opaque color types"

This reverts commit 9835dd51b320271bd0347cd6a71d7ee27c40ede7.

Reason for revert: Chrome unit tests failing?

Original change's description:
> Fix image info checking for always-opaque color types
> 
> The old code overlooked 101010x and 888x. The GPU code for
> readPixels tried to enfore this, but incorrectly, and the
> writePixels code missed it entirely.
> 
> Bug: skia:
> Change-Id: Ib69473703f2ae7604d4b21ec6728b7d764becd9a
> Reviewed-on: https://skia-review.googlesource.com/c/161148
> Commit-Queue: Brian Osman <brianosman@google.com>
> Commit-Queue: Brian Salomon <bsalomon@google.com>
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Reviewed-by: Mike Klein <mtklein@google.com>
> Auto-Submit: Brian Osman <brianosman@google.com>

TBR=mtklein@google.com,bsalomon@google.com,brianosman@google.com

Change-Id: I360375f2bf21576db914f5e177ac56e398ca7023
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/c/161380
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
2 files changed