Bug 906909 - Make LinkedList::debugAssertIsSane() compile. r=waldo

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extra : rebase_source : 60027f53b4a8fa91dd7e42863c271c36395d6851
Bug 907227 - Properly delete LinkedListElement's implicit copy-constructor and operator=. r=waldo

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extra : rebase_source : b5f09c990f38537266c3e42a211a483e1dd291d6