cc: Use ResourceUtil::UncheckedWidthInBytes() in CopyOnWorkerThread().
cc: Use ResourceUtil::UncheckedWidthInBytes() in CopyOnWorkerThread().

Use unchecked version for computing bytes_per_row in
OneCopyTileTaskWorkerPool::CopyOnWorkerThread() function to check
overflow or underflow conditions in debug builds.

BUG=
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1879153003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#388034}

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