Storage Service: Add missing mojo dependency.

https://crrev.com/c/2059752 introduced a dependency on
//services/network/public/mojom/cross_origin_embedder_policy.mojom
in
//components/services/storage/public/mojom/service_worker_database.mojom

This means the Storage Service's mojo interface now depends on the
Network Service. This CL makes the dependency explicit.

Bug: 994911
Change-Id: I1b9806d8f50183c3f551f071f01ed9a60625d591
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2587653
Commit-Queue: Victor Costan <pwnall@chromium.org>
Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836332}

components/services/storage/public/mojom/BUILD.gn

@@ -22,6 +22,7 @@ mojom("mojom") {
   public_deps = [
     "//components/services/storage/public/mojom/filesystem",
     "//mojo/public/mojom/base",
+    "//services/network/public/mojom",
     "//third_party/blink/public/mojom:mojom_core",
     "//third_party/blink/public/mojom:mojom_modules",
     "//third_party/blink/public/mojom:mojom_platform",