Revert of Improve GLSL integer support (patchset #1 id:1 of https://codereview.chromium.org/1669853002/ )

Reason for revert:
MSAN bots are unhappy with this change: https://build.chromium.org/p/chromium.memory.fyi/builders/Linux%20ChromeOS%20MSan%20Tests/builds/7068

Original issue's description:
> Improve GLSL integer support
>
>  - Adds shader types for uint.
>  - Adds a cap for integer support.
>  - Uses glVertexAttribIPointer for integer attribs.
>
> BUG=skia:
> GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1669853002
>
> Committed: https://skia.googlesource.com/skia/+/3a2caf8ecf38124f4ad21a0f6c4dabfcfa17911a

TBR=bsalomon@google.com,egdaniel@google.com,ethannicholas@google.com,cdalton@nvidia.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/1674813004
17 files changed