Replace LOG(INFO) with VLOG(1) in MobileActivator.

This CL accomplishes nothing but to make the presubmit check happy :(

BUG=None
TEST=Presubmit check doesn't cry anymore :)

Review URL: https://codereview.chromium.org/111393002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239783 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 239783