Implement chromium.self in content scripts, fix bugs

chrome/test/data/extensions/content_script_inject/script1.css

Index: chrome/test/data/extensions/content_script_inject/script1.css
diff --git a/chrome/test/data/extensions/content_script_inject/script1.css b/chrome/test/data/extensions/content_script_inject/script1.css
new file mode 100644
index 0000000000000000000000000000000000000000..521b501b66b4c28d0d91100d0405b0ad074f64c4
--- /dev/null
+++ b/chrome/test/data/extensions/content_script_inject/script1.css
@@ -0,0 +1,10 @@
+/*
+Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
+Use of this source code is governed by a BSD-style license that can be
+found in the LICENSE file.
+*/
+
+/* script1b.js tests that this rule was applied. */
+body {
+  background:red;
+}