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Instead of using a "fake" select field, we integrate it more naturally as per
Moe's comments by implementing a select for the month field. See:
https://chromium-review.googlesource.com/c/chromium/src/+/1240913

Bug: 881096
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: I467c0c9c33ef4f4239f39743672d22de6bf66d06
Reviewed-on: https://chromium-review.googlesource.com/1256067Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Reviewed-by: Eric Noyau <noyau@chromium.org>
Commit-Queue: ericale <ericale@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595896}