Fix build with system ICU when using bundled v8.

BUG=none
R=thestig@chromium.org

Review URL: https://codereview.chromium.org/26408002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227408 0039d316-1c4b-4281-b951-d872f2087c98
Move APIPermission, APIPermissionSet, PermissionsInfo to top-level extensions.

BUG=298586
TBR=sky@chromium.org

Review URL: https://codereview.chromium.org/26024004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227409 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227409