Use PartitionAlloc for fastMalloc on Android
Use PartitionAlloc for fastMalloc on Android

This switches fastMalloc to PartitionAlloc for Android. Previously, we only
used PartitionAlloc for fastMalloc on Mac OS X.

BUG=312725
R=tonyg@chromium.org

Review URL: https://codereview.chromium.org/148013010

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@166040 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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