OnionSoup: Move app_banner.mojom in public/platform to public/mojom

This CL moves app_banner.mojom in public/platform/modules to
public/mojom/app_banner and updates paths for app_banner.mojom.

Bug: 919393
Change-Id: I4999b238924c6aae5885e19eb0d25f4fd47669d4
Reviewed-on: https://chromium-review.googlesource.com/c/1496124
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Julie Jeongeun Kim <jkim@igalia.com>
Cr-Commit-Position: refs/heads/master@{#637258}
10 files changed