GitLab

To resolve code review comments from https://codereview.chromium.org/2675033002/diff/280001/chrome/browser/media/router/mojo/media_router.mojom

Create an ip_address.mojom to be used by media_router.mojom

BUG=698423

Review-Url: https://codereview.chromium.org/2745643002
Cr-Commit-Position: refs/heads/master@{#456115}