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On Win10, VirtualQueryEx supports querying the x64 part of WOW64 processes. However, on lower OSs it errors past 2/3G. There's no direct way to retrieve to maximum memory address for processes other than yourself, but fortunately, VirtualQueryEx sets a distinct error code when `lpAddress` exceeds the maximum accessible address, so we can just terminate successfully in that case. R=mark@chromium.org BUG=crashpad:20, crashpad:46 Review URL: https://codereview.chromium.org/1376353002 .