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This patch is initiated from this comment[1].
After this patch, the following small bugs are also fixed.
  - The PaymentResponse.details should always return same object.
  - If no details, should return empty object instead of undefined.

[1] https://chromium-review.googlesource.com/c/chromium/src/+/1226774/6/third_party/blink/renderer/modules/payments/payment_method_change_event.h#42

Bug: none
Change-Id: Ib784013fbdedd42d30eb820a82d51ec4d08550f4
Reviewed-on: https://chromium-review.googlesource.com/c/1253862
Commit-Queue: Jinho Bang <jinho.bang@samsung.com>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596143}