Bug 940811 - Enable the gradient cache for canvas. r=Bas a=lsblakk

--HG--
extra : transplant_source : %A6%1B%0A%3F-%60%C3-%5B%8D%2C%94%9FC%BFI%C7%E0%CD2
Bug 952602 - #ifdef EARLY_BETA_OR_EARLIER to disable navigator.plugins[] cloaking before GA release. r=bsmedberg a=lsblakk