Backed out 3 changesets (bug 837416) because of test failures

Backed out changeset 1d7232646d12 (bug 837416)
Backed out changeset 476af8f75f28 (bug 837416)
Backed out changeset 428b29658d07 (bug 837416)

--HG--
rename : content/html/content/src/HTMLStyleElement.cpp => content/html/content/src/nsHTMLStyleElement.cpp