Remove calls to getRefCnt() in Blink.
Remove calls to getRefCnt() in Blink.

We've deprecated getRefCnt() for unique().  At this point, only unittests and
asserts are calling getRefCnt().  To really get rid of it, we'd like to turn
as many getRefCnt() calls as possible into calls to unique().

There's no loss in testing precision here.  EXPECT_EQ(1, foo->getRefCnt()) is
semantically identical to EXPECT_TRUE(foo->unique()).

BUG=skia:3160

Review URL: https://codereview.chromium.org/753183005

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@185902 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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