Code refactoring for angle::BitSet and EXPECT_GL_TRUE/FALSE. This change refactors two style issues to make it be consistent. 1) This CL uses "using" to replace "typedef" for all angle::BitSet<...>. 2) This CL uses EXPECT_GL_TRUE/FALSE to replace EXPECT_EQ for bool comparison. BUG=angleproject:2005 Change-Id: I4afad92313ea2457bbfedf80f917a5873d7f29ee Reviewed-on: https://chromium-review.googlesource.com/795871 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>