Avoid superflous v8::Local<.> object creation in
DOMDataStore::holderContainsWrapper.

(This likely caused a performance regression. See bug for details.)


R=jochen@chromium.org
BUG=367132

Review URL: https://codereview.chromium.org/253863002

git-svn-id: svn://svn.chromium.org/blink/trunk@172899 bbb929c8-8fbe-4397-9dbb-9b2b20218538