Revert of Isolate extensions_browsertests (patchset #7 id:120001 of https://codereview.chromium.org/869783004/)

Reason for revert:
This CL seem to cause the failure in extension browser test in Windows Vista SP2

Original issue's description:
> Isolate extensions_browsertests
>
> R=maruel@chromium.org, yoz@chromium.org
> TBR=jam@chromium.org
> BUG=98637
>
> Committed: https://crrev.com/d1caf97fe8db47e5c76043bccbf4dd4a42265831
> Cr-Commit-Position: refs/heads/master@{#312993}

TBR=maruel@chromium.org,yoz@chromium.org,scottmg@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=98637

Review URL: https://codereview.chromium.org/876633002

Cr-Commit-Position: refs/heads/master@{#313062}
7 files changed