Make sure cros.DEPS dependencies are only checked out on linux.

R=satorux@chromium.org
BUG=
TEST=

Review URL: http://codereview.chromium.org/7663010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@96953 0039d316-1c4b-4281-b951-d872f2087c98

tools/cros.DEPS/DEPS

@@ -2,9 +2,11 @@ vars = {
   "chromiumos_git": "http://git.chromium.org/chromiumos",
 }
 
-deps = {
-  "src/third_party/cros":
-    Var("chromiumos_git") + "/platform/cros.git@56c93050",
-  "src/third_party/cros_system_api":
-    Var("chromiumos_git") + "/platform/system_api.git@d56d4785",
+deps_os = {
+  "unix" : {
+    "src/third_party/cros":
+      Var("chromiumos_git") + "/platform/cros.git@56c93050",
+    "src/third_party/cros_system_api":
+      Var("chromiumos_git") + "/platform/system_api.git@d56d4785",
+  }
 }