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While Chrome checks both the 32- and 64-bit registries to discover
native messaging hosts, Firefox only checks the native registry. This
poses a challenge, as 32-bit installers generally aren't allowed to
install 64-bit components (such as registry keys). However, it turns out
that it is possible to suppress the resulting error, and this CL does
just that, allowing the required keys to be installed in the native
registry on 64-bit Windows.

Bug: 880542
Change-Id: I2552d24ec7dd2e7cce8febdc42b048a1e5caf568
Reviewed-on: https://chromium-review.googlesource.com/1213956
Commit-Queue: Erik Jensen <rkjnsn@chromium.org>
Reviewed-by: Joe Downing <joedow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589725}