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This reverts commit 90c5851b.

Reason for revert: This introduces tests that constantly fail, https://ci.chromium.org/p/chromium/builders/ci/win-asan/8177. 

Original change's description:
> [WebLayer] Add tests for chrome://weblayer page
> 
> This page recently broke (fix in http://crrev.com/c/1880171), so tests
> seem like a good idea.
> 
> This also adds a test helper for executing javascript, and makes the
> NavigateAndWaitForCompletion function work more similarly to the one in
> the instrumentation tests by waiting until the page is finished loading.
> 
> Bug: 1017924
> Change-Id: I8ca048f9a9a92808abf6cfa5d0e091550cc3d9a6
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1880173
> Commit-Queue: Clark DuVall <cduvall@chromium.org>
> Reviewed-by: Scott Violet <sky@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#709552}

TBR=sky@chromium.org,cduvall@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1017924
Change-Id: Ifc5689dc8bb0ec9fdc793bdbb79f44c5388b2266
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1886413Reviewed-by: Kamila Hasanbega <hkamila@chromium.org>
Commit-Queue: Kamila Hasanbega <hkamila@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710272}