Revert 143426 - Sandbox GYP: separate Windows and Linux

- Have Windows and Linux sandbox GYP in their own .gypi files

- Cleanup things:
  * Get rid of the sandbox_windows_target variable
  * Merge all Linux targets into one Linux section

BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/10536228

TBR=jln@chromium.org
Review URL: https://chromiumcodereview.appspot.com/10633012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@143433 0039d316-1c4b-4281-b951-d872f2087c98
3 files changed