Jumbo build fix: Too many Mixin classes in oilpan tests.

Both HeapTest.cpp and IncrementalMarkingTest.cpp use local
test classes named Mixin. When compiled together in the
same translation unit, it will not compile.

TBR=haraken@chromium.org

Change-Id: Idfdfae3a9d81c5a1ad7d039818e06e11157806ef
Reviewed-on: https://chromium-review.googlesource.com/789863
Reviewed-by: Daniel Bratell <bratell@opera.com>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Daniel Bratell <bratell@opera.com>
Cr-Commit-Position: refs/heads/master@{#519292}
1 file changed