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On recent Windows insider builds GetModuleHandleExW loads sections for
inspection as non-executable images, rather than as files. This leads
to our hooks detecting the SEC_IMAGE attribute and potentially patching
functions (e.g. for user32.dll).

This caused content_browsertests to fail as it pinned user32.dll in some
processes. With this change, the tests run again.

See crbug.com/1143397 for a full discussion.

Bug: 1143397
Change-Id: I3b75464d0442160a417e4cb7084306841aaf76f7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2511531Reviewed-by: Will Harris <wfh@chromium.org>
Commit-Queue: Alex Gough <ajgo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823354}