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This is a reland of 4184bbb0

Original change's description:
> Convert browser side's legacy IPCs of BlinkTest message to Mojo
>
> As a step to convert legacy IPCs to the Mojo, this CL
> converts browser side's BlinkTest IPCs to Mojo. This
> CL introduces WebTestClient interface to replace the
> IPC messages to Mojo methods in web_test.mojom file.
> The interface starts to support the original messages
> as below,
>
>  - InitiateLayoutDump()
>  - PrintMessageToStderr()
>  - SetPopupBlockingEnabled()
>  - NavigateSecondaryWindow()
>  - GoToOffset
>  - Reload()
>  - LoadURLForFrame()
>  - CloseRemainingWindows()
>  - ResetDone()
>  - SendBluetoothManualChooserEvent()
>  - GetBluetoothManualChooserEvents()
>  - SetBluetoothManualChooser()
>
> This CL should not change any behavior.
>
> Bug: 1039247
> Change-Id: Ic30f8cc0cb19ec8a306b577f3c10567d91bdccf1
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2002047
> Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
> Reviewed-by: Mike West <mkwst@chromium.org>
> Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
> Cr-Commit-Position: refs/heads/master@{#732388}

Bug: 1039247
Change-Id: I16f452ba3c78f69f31d04cb3c92c5b76a3814c86
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2007311
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Reviewed-by: Mike West <mkwst@chromium.org>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733790}