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This CL converts PaymentManager{Ptr, Request} in content and blink
to the new Mojo types.

Bug: 955171, 978694
Change-Id: I09c3019d634a764e1ed7d02cb45a23e550087a4e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1780100Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Cr-Commit-Position: refs/heads/master@{#693124}