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Currently, it is not constexpr, so may not be built on compile time.
Actually, no-op editing of the keycode_converter.cc sometimes
triggers static initializer check.

Specifically, DomKey used in the tables is not constexpr aware,
so this CL makes the change.

BUG=1137426
TEST=Built on mac-rel bot. Made sure no static initializer check error.

Change-Id: Ib2d070c0cc29c725d4b7a0df000940685086d570
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2462978
Commit-Queue: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816557}