Oilpan: consistently use IsGarbageCollectedMixin<> trait.
Use blink::IsGarbageCollectedMixin<T> to test if the object
T implements GarbageCollectedMixin. It handles objects that
have multiple GarbageCollectedMixin bases.
With that in place for WebPrivatePtr<>'s LifetimeOf trait,
SpeechRecognition's specialization for it can be retired.
R=haraken
BUG=420515
TBR=tkent
Review URL: https://codereview.chromium.org/1007803004
git-svn-id: svn://svn.chromium.org/blink/trunk@191900 bbb929c8-8fbe-4397-9dbb-9b2b20218538
3 files changed
