This allows Skia to remove
SK_SUPPORT_LEGACY_CANVAS_VERTICES
SK_SUPPORT_LEGACY_BITMAP_SETPIXELREF
SK_SUPPORT_LEGACY_PIXELREFFACTORY
Test: Existing CTS cover these changes
Running CtsGraphicsTestCases, there were 6 failures w/ and w/o this CL.
None of the 6 seems related to this CL.
Change-Id: I724082357d9f6cb699770df3c0b9ef555b957697