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In 48bedbd2 a new reason was added to force an Indexed DB closed:
for migration. This change failed to add a value in enums.xml for UMA.

Not strictly related to 643544, but was noticed when reviewing UMA
values post change.

Bug: 643544
Change-Id: I793df6967a80046775babb1cf0af242b2c148374
Reviewed-on: https://chromium-review.googlesource.com/792031Reviewed-by: Joshua Bell <jsbell@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Commit-Queue: Chris Mumford <cmumford@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519756}