Fix scons build where the internal theme files don't exist.

Review URL: http://codereview.chromium.org/28218


git-svn-id: svn://svn.chromium.org/chrome/trunk/src@10515 0039d316-1c4b-4281-b951-d872f2087c98

tools/grit/grit/scons.py

@@ -147,7 +147,12 @@ def _Scanner(file_node, env, path):
          node.parent.name == 'translations')):
       files.append(os.path.abspath(node.GetFilePath()))
     elif node.name == 'include':
-      files.append(node.FilenameToOpen())
+      # We depend on all resources specified in the grd file.  However, some
+      # files are only used by official builds and aren't in the public
+      # repository (e.g., the Google Chrome logo).  If the file doesn't exist,
+      # just don't add it to the file dependencies.
+      if os.path.exists(node.FilenameToOpen()):
+        files.append(node.FilenameToOpen())
 
   # Add in the grit source files.  If one of these change, we want to re-run
   # grit.