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Before this patch, the desktop logic for checking whether the payment
app is waiting for a price update from the merchant was defined
in the desktop controller, which prevented from sharing this logic
across platforms and in different types of payment apps.

This patch moves PaymentHandlerHost.is_waiting() check from
payment_request.cc to service_worker_payment_app.cc.

After this patch, the logic for checking whether the payment app is
waiting for a price update is defined in the potentially cross-platform
payment app interface.

Design: https://bit.ly/cross-platform-pay-app-factory

Bug: 1083242
Change-Id: Idde2f1c9396641835f154be19ac7d2901c1c1d14
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2207973
Commit-Queue: Rouslan Solomakhin <rouslan@chromium.org>
Reviewed-by: Liquan (Max) Gu <maxlg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771029}