Revert 224694 "Speculative switch to spawned test server rather ..."

The switch turned out to not do anything, so therefore I'm reverting this patch.

> Speculative switch to spawned test server rather than embedded.
> 
> Moving the embedded server initialization didn't help. This is the next attempt at resolving our load hangs.
> 
> TBR=tommi@chromium.org
> BUG=281492
> 
> Review URL: https://chromiumcodereview.appspot.com/24261008

TBR=phoglund@chromium.org

Review URL: https://codereview.chromium.org/24363009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@224963 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 224963