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This reverts commit c67306a2.

Reason for revert: This breaks build Linux ChromiumOS MSan Tests in https://ci.chromium.org/p/chromium/builders/ci/Linux%20ChromiumOS%20MSan%20Tests/20900
Failed test is DevToolsListenerBrowserTest.CanCollectCodeCoverage

Original change's description:
> [filesapp] Add a browser_test for DevToolsListener class
>
> Test that JS code coverage of a JS IFFE injected in a WebContents gets
> collected by DevToolsListener and stored in a ScopedTempDir.
>
> Test: browser_tests --gtest_filter="*DevToolsListener*"
> Bug: 1113941
> Change-Id: I8f04f2e704d677823ffa154272605798b7046f77
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2461602
> Commit-Queue: Ben Reich <benreich@chromium.org>
> Commit-Queue: Noel Gordon <noel@chromium.org>
> Reviewed-by: Noel Gordon <noel@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#816064}

TBR=noel@chromium.org,benreich@chromium.org

Change-Id: I2d838b427cd407a19ac7eb82bae1cf3ffe13592a
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1113941
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2467039Reviewed-by: Maggie Cai <mxcai@chromium.org>
Commit-Queue: Maggie Cai <mxcai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816401}