Bug 836050 part 1.  Make Element::GetAttr non-virtual.  r=smaug
Bug 836050 part 2.  Make Element::HasAttr non-virtual.  r=smaug
Bug 836050 part 3.  Make Element::AttrValueIs non-virtual.  r=smaug
Add a test for WebIDL-weakmap stuff in addition to XPConnect-weakmap.  No bug, no review

--HG--
rename : js/xpconnect/tests/mochitest/test_bug655297.html => js/xpconnect/tests/mochitest/test_bug655297-1.html
rename : js/xpconnect/tests/mochitest/test_bug655297.html => js/xpconnect/tests/mochitest/test_bug655297-2.html