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This reverts commit fd03e16d.

Reason for revert: crbug.com/1045444

Original change's description:
> Metal: Test offline-compiled shader link time
> 
> Change metal_util::TestShader to test either compile or link, and
> change the default behavior to link.
> 
> Add inline data for a trivial test shader. Add code to modify the
> bitcode, to defeat caching.
> 
> Ensure that the Metal calls for the test are invoked on a thread
> that has base::TaskPriority::HIGHEST.
> 
> TBR=jvanverth
> 
> Bug: 974219
> Change-Id: I35e688c3758af2e03f893a1ccbef7aef6b778b23
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2015486
> Reviewed-by: ccameron <ccameron@chromium.org>
> Commit-Queue: ccameron <ccameron@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#734645}

TBR=ccameron@chromium.org,jvanverth@chromium.org

Change-Id: I872bad72bfd2bbb4318e032db4b14bf43e14d6e6
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 974219
Bug: 1045444
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2020567Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Commit-Queue: Kai Ninomiya <kainino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735116}