Revert of Moves mojo_js_integration_tests into blink. (patchset #11 id:190001 of https://codereview.chromium.org/2734783008/ )

Reason for revert:
Seems related to webkit failures of the JsToCpp tests. E.x. https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac10.10/builds/34530.

Original issue's description:
> Moves mojo_js_integration_tests into blink.
>
> BUG=699569
>
> Review-Url: https://codereview.chromium.org/2734783008
> Cr-Commit-Position: refs/heads/master@{#477549}
> Committed: https://chromium.googlesource.com/chromium/src/+/dd57fa764813de09d159a232eeef1bb21b0ccc1e

TBR=jbroman@chromium.org,dpranke@chromium.org,yzshen@chromium.org,alokp@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=699569

Review-Url: https://codereview.chromium.org/2926143002
Cr-Commit-Position: refs/heads/master@{#477653}
14 files changed