Revert of Add ExecuteJavaScriptForTest and make all tests use it

Revert of Add ExecuteJavaScriptForTest and make all tests use it (patchset #15 id:270001 of https://codereview.chromium.org/1123783002/)

Reason for revert:
Speculatively reverting to address failures,

 http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Linux/builds/51422

Original issue's description:
> Add ExecuteJavaScriptForTest and make all tests use it
>
> Additionally, restrict the URLs that ExecuteJavaScript can be invoked on
> to chrome-controlled URLs.
>
> R=jam@chromium.org
> BUG=507809
>
> Committed: https://crrev.com/904f14ebdc3bdb8e893df0a3211d09de42d5619c
> Cr-Commit-Position: refs/heads/master@{#340231}

TBR=jam@chromium.org,mdjones@chromium.org,torne@chromium.org,jochen@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=507809
Committed: https://crrev.com/f08040289fb0ed72c792863d2dab73fe4d1ca943
Cr-Commit-Position: refs/heads/master@{#340241}

[sof, 2015-07-24 08:40:17]

Created Revert of Add ExecuteJavaScriptForTest and make all tests use it

[commit-bot: I haz the power, 2015-07-24 08:40:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1257603003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1257603003/1

[commit-bot: I haz the power, 2015-07-24 08:41:30]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-24 08:42:31]

Patchset 1 (id:??) landed as
https://crrev.com/f08040289fb0ed72c792863d2dab73fe4d1ca943
Cr-Commit-Position: refs/heads/master@{#340241}