Implement chromium.self in content scripts, fix bugs

chrome/test/data/extensions/content_script_inject/script1a.js

Index: chrome/test/data/extensions/content_script_inject/script1a.js
diff --git a/chrome/test/data/extensions/content_script_inject/script1a.js b/chrome/test/data/extensions/content_script_inject/script1a.js
new file mode 100755
index 0000000000000000000000000000000000000000..87f4f5564aee39270c02740b98d4710d72a7db6a
--- /dev/null
+++ b/chrome/test/data/extensions/content_script_inject/script1a.js
@@ -0,0 +1,7 @@
+// Copyright (c) 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.
+
+// create a global variable. script1b.js tests to make sure it is visible and
+// script2.js tests to make sure it is not.
+var script1_var = 1;