[ISpy] Rename chrome_utils -> ispy_api

BUG=None
TEST=Updated unittests
NOTRY=True

Review URL: https://codereview.chromium.org/165693004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252691 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 252691