Revert "Add IPC benchmarking API to Blink TestRunner"

Revert "Add IPC benchmarking API to Blink TestRunner" (patchset #3 of https://codereview.chromium.org/478483005/ , commit 345949391e63d5237326eb16771ae48af0a2e881.)

Reason for revert:
Breaks fast/dom/Window LayoutTests

 http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Linux/builds/35621
 http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac10.9/builds/10059

Original issue's description:
> Add IPC benchmarking API to Blink TestRunner
> 
> This add an window.testRunner API that sends do-nothing IPC message
> roundtrip. This API can be used to build IPC benchmark using
> JavaScript.
> 
> TEST=none (Will add blink-side LayoutTest once this is landed)
> BUG=402185
> R=darin@chromium.org, jam@chromim.org, jochen@chromium.org
>
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=290063

TBR=morrita@chromium.org, darin@chromium.org, jochen@chromium.org, jam@chromium.org
BUG=402185
NOTRY=true

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=290153

[sof, 2014-08-16 16:09:03]

The CQ bit was checked by sigbjornf@opera.com

[commit-bot: I haz the power, 2014-08-16 16:09:31]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/sigbjornf@opera.com/477343002/1

[commit-bot: I haz the power, 2014-08-16 16:09:51]

Committed patchset #1 (1) as 290153

[Hajime Morrita, 2014-08-18 19:32:53]

Oops. Thanks for taking care of it.