Remove LOG(INFO) from Files.app/Drive code.

To reduce log flood.

BUG=none

Review URL: https://codereview.chromium.org/97973003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238045 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238045