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The regionCode attribute was removed in spec side[1]. FYI, the attribute
was behind runtime flag and have never shipped. So, we don't need to
send intents to blink-dev.

[1] https://github.com/w3c/payment-request/pull/823

Bug: 925722
Change-Id: I85b370770141b1caf69389e399358b82ad071b89
Reviewed-on: https://chromium-review.googlesource.com/c/1438981Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Jinho Bang <jinho.bang@samsung.com>
Cr-Commit-Position: refs/heads/master@{#626895}