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This reverts commit ec6127ba.

Reason for revert: Caused flaky test failure on WebKit Linux Leak.

Original change's description:
> Convert WebTestHostMsg_InitiateCaptureDump to Mojo
> 
> This CL migrates the legacy InitiateCaptureDump IPC message
> to the new Mojo defined in WebTestClient interface.
> 
> Bug: 1039247
> Change-Id: Idd38ecf67d10593f3bfc6f3c48d9832514cec595
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2032634
> Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
> Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
> Reviewed-by: Mike West <mkwst@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#739222}

TBR=dtapuska@chromium.org,mkwst@chromium.org,gyuyoung@igalia.com

Change-Id: Ie0bc76b7d3c8dd67481d67d0ee22b0338d87334f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1039247
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2043531Reviewed-by: Gyuyoung Kim <gyuyoung@igalia.com>
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Cr-Commit-Position: refs/heads/master@{#739357}