Fix assert in grit script by always resolving template vars.

tools/grit/grit/testdata/substitute_tmpl.grd

Index: tools/grit/grit/testdata/substitute_tmpl.grd
diff --git a/tools/grit/grit/testdata/substitute_tmpl.grd b/tools/grit/grit/testdata/substitute_tmpl.grd
new file mode 100644
index 0000000000000000000000000000000000000000..be7b6017075e8ddb82208df760d31595aae897da
--- /dev/null
+++ b/tools/grit/grit/testdata/substitute_tmpl.grd
@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="UTF-8"?> <!-- -*- XML -*- -->
+<grit
+    base_dir="."
+    source_lang_id="en"
+    tc_project="GoogleDesktopWindowsClient"
+    latest_public_release="0"
+    current_release="1"
+    enc_check="möl">
+  <outputs>
+    <output filename="resource.h" type="rc_header" />
+    <output filename="en_${name}_resources.rc" type="rc_all" lang="en" />
+    <output filename="sv_${name}_resources.rc" type="rc_all" lang="sv" />
+  </outputs>
+  <translations>
+    <file path="substitute.xmb" lang="sv" />
+  </translations>
+  <release seq="1" allow_pseudo="false">
+    <messages first_id="8192">
+      <message name="IDS_COPYRIGHT_GOOGLE_LONG" sub_variable="true" desc="Gadget copyright notice.  Needs to be updated every year.">
+        Copyright 2008 Google Inc. All Rights Reserved.
+      </message>
+      <message name="IDS_NEWS_PANEL_COPYRIGHT">
+        Google Desktop News gadget
+[IDS_COPYRIGHT_GOOGLE_LONG]
+View news that is personalized based on the articles you read.
+
+For example, if you read lots of sports news, you'll see more sports articles. If you read technology news less often, you'll see fewer of those articles.
+      </message>
+    </messages>
+  </release>
+</grit>