Revert of Convert the re2 GYP targets to be generated by GN. (https://codereview.chromium.org/68853015/)

Reason for revert:
Broke Blink compile

Original issue's description:
> Convert the re2 GYP targets to be generated by GN.
> 
> BUG=288991
> R=bradnelson@google.com
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=245254

TBR=bradnelson@chromium.org,bradnelson@google.com
NOTREECHECKS=true
NOTRY=true
BUG=288991

Review URL: https://codereview.chromium.org/141063002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245271 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 245271