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This patch implements WebContentsUserData in PaymentAppProviderImpl
include below changes.

- PaymentAppProviderImpl will be owned WebContents rather than
it being a singleton.

- GetSourceIdForPaymentAppFromScope, IsValidInstallablePaymentApp
are moved out PaymentAppProviderUtil class.
This is a simple helper class that is not related WebContents.

Bug: 1075687
Change-Id: I62d212a53506e40bc104e59a18540898fd591946
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2282824Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Commit-Queue: DongJun Kim <djmix.kim@samsung.com>
Cr-Commit-Position: refs/heads/master@{#809808}