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1) Merge the abstract class _Top25RuntimeStats with V8Top25RuntimeStats since it's the only one inherit from the abstract class.
2) Remove the disabling Android in perf/expectations.config & switch to use SUPPORTED_PLATFORMS which is meant for permanent disabling logic like this case

Change-Id: I07fecfd3d9cce3e7d35ac71b274bb9416f0cdcac

TBR=perezju@chromium.org

Change-Id: I07fecfd3d9cce3e7d35ac71b274bb9416f0cdcac
Reviewed-on: https://chromium-review.googlesource.com/1175928Reviewed-by: Ned Nguyen <nednguyen@google.com>
Commit-Queue: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#583336}