Properly substitute variables that reference paths outside SRCDIR.

grit/node/misc_unittest.py

Index: grit/node/misc_unittest.py
diff --git a/grit/node/misc_unittest.py b/grit/node/misc_unittest.py
index 496d1531615608b034db864912aa72877f6a2805..b353edb0b7a889271b8e0becf91d0e7f2483e342 100644
--- a/grit/node/misc_unittest.py
+++ b/grit/node/misc_unittest.py
@@ -46,6 +46,12 @@ class GritNodeUnittest(unittest.TestCase):
     self.assertEqual({},
         id_dict.get('out/Release/obj/gen/devtools/devtools.grd', None))
 
+    src_dir, id_dict = misc._ReadFirstIdsFromFile(
+        test_resource_ids,
+        {
+          'SHARED_INTERMEDIATE_DIR': '/outside/src_dir',
+        })
+    self.assertEqual({}, id_dict.get('devtools.grd', None))
 
 class IfNodeUnittest(unittest.TestCase):
   def testIffyness(self):