Switching sandbox to gyp on windows.

Rolling forward deps on gyp to get 'copies' support.
This time handled wow_helper.

Review URL: http://codereview.chromium.org/42355

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@12270 0039d316-1c4b-4281-b951-d872f2087c98