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This CL plumbs RenderFrameHost into InstallablePaymentAppCrawler so it
can be provided to ManifestIconDownloader to download the icon in the
correct frame that initiated the PaymentRequest.

The ManifestIconDownloader was previously changed to expect the global
frame routing ID instead of RenderFrameHost* (crrev.com/c/2085752).
This will be changed to use RenderFrameHost* directly in a subsequent
CL per a post-commit comment.

After this change, all payments code can also be cleaned up to look
up WebContents* from the RenderFrameHost* instead of retaining both.
This will also be cleaned up in a subsequent CL.

Bug: 1055360
Change-Id: Ic431b04ff88d1ac0235172391c9697bbd0ec8fa9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2097242Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Commit-Queue: Danyao Wang <danyao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749149}