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This patch is for refactoring RespondWithCallback class
and include below changes.

- Expose RespondWithCallback from PaymentAppProviderImpl.

- Adds helper class like as "ServiceWorkerCoreThreadEventDispatcher"
it appears that all of the functions that access WebContents on the
service worker core thread are for dispatching some type of event.

- Remove InvokeRespondWithcallbacksRepository then
ServiceWorkerCoreThreadEventDispatcher owns an instance of
InvokeRespondWithCallback instead and manage its lifetime.

Bug: 1075687
Change-Id: I34ee154600a137ef47a03f797f15da689d205a79
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2368660
Commit-Queue: DongJun Kim <djmix.kim@samsung.com>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809926}