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Four small changes:

1. Make a js_library that depends on the
   //services/device/public/mojom:mojom_externs_js_library. This
   unearthens a bunch of problems.
2. Add externs for nested enum in interfaces and in structs.
3. Refactor externs type generator to correctly generate externs for
   nested enums, structs, and unions.
4. Changed the generated externs to not generate
   "mojo.internal.AssociatedInterfaceProxy" and
   "mojo.internal.AssociatedInterfaceRequest" since they are not
   fully supported by the lite bindings yet.

Change-Id: Ife282be5e2b5dde5fc17a345c138981812a617d8
Reviewed-on: https://chromium-review.googlesource.com/c/1369560
Commit-Queue: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: calamity <calamity@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#615687}