Bug 900125: Add Math.fround to the interpreter; r=sstangl
Bug 900125: Tests for Math.fround; r=waldo
Bug 904351, make MimeType/Array, PluginArray/Element to hold strong reference to their parent object, r=mccr8

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extra : rebase_source : 955958237c5b4dd5a062b5d40ae976f7da31a33f