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Map EF_MOD3_DOWN to GDK_MOD_MASK when converting ui::KeyEvent into
GdkEventKey before injecting key events into GtkIM. Mapping it to
GDK_META_MASK is wrong and breaks Neo layout Layer 4 keys decoding.

Bug: 1025376
Change-Id: I34afb73e006278e78f64b9b084732ee1176f70ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1917052Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Nick Yamane <nickdiego@igalia.com>
Cr-Commit-Position: refs/heads/master@{#715962}