Suppress handle leaks in content::BrowserGpuMemoryBufferManager.
Suppress handle leaks in content::BrowserGpuMemoryBufferManager.

BUG=595105
TBR=glider@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/1805223002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#381338}

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