Suppress handle leaks in ChildSharedBitmapManager / HostDiscardableSharedMemoryManager
Suppress handle leaks in ChildSharedBitmapManager / HostDiscardableSharedMemoryManager

BUG=580636
TBR=erikchen@chromium.org

Review URL: https://codereview.chromium.org/1624613002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#371023}

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