Remove usage of deprecated V8 APIs from content unittests

R=marja@chromium.org
BUG=324225

Review URL: https://codereview.chromium.org/98583005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238074 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238074
drive: Stop handling drive/other in ChangeListLoader

BUG=324719

Review URL: https://codereview.chromium.org/98393003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238075 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238075