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Before this patch, payment_app_provider_impl.cc cleared the
|ready_for_minimal_ui| and |account_balance| fields of
CanMakePaymentResponsePtr before forwarding the struct the service
worker payment app factories.

This patch validates the |account_balance| field of the
CanMakePaymentResponsePtr struct and forwards to the payment app
factories either the valid unchanged struct or a blank struct in case of
validation failure.

After this patch, the service worker payment app factories receive the
full validated CanMakePaymentResponsePtr struct from the renderer.

Bug: 1005076
Change-Id: I27c3b07e29804cce0b52ae7f137225007dfe4853
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2091647
Commit-Queue: Rouslan Solomakhin <rouslan@chromium.org>
Reviewed-by: Danyao Wang <danyao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749606}