Backed out changesets 34927afb65e2 and 2d0b056ced49 (bug 838559) for mochitest failures.

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rename : content/html/content/src/HTMLMenuElement.cpp => content/html/content/src/nsHTMLMenuElement.cpp
rename : content/html/content/src/HTMLMenuElement.h => content/html/content/src/nsHTMLMenuElement.h