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This patch was initiated from here[1] and makes the code more readable.

[1] https://chromium-review.googlesource.com/c/chromium/src/+/1142045/5/third_party/blink/renderer/modules/payments/payment_request.h#132

Bug: none
Change-Id: I28b464e89c67029cc1642e8095469a19b9a86050
Reviewed-on: https://chromium-review.googlesource.com/1162091
Commit-Queue: Jinho Bang <jinho.bang@samsung.com>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580753}