Load application manifests from resources

- Renames content's builtin apps to content_browser and content_renderer
- Supports loading manifests from resources instead of files
- Derives chrome's manifests from content's without duplicating metadata
- Avoids all filesystem lookups for existing apps in content today
- Ensures all content embedders have a working shell connection with capabilities

BUG=594419

Review URL: https://codereview.chromium.org/1828733004

Cr-Commit-Position: refs/heads/master@{#385823}


CrOS-Libchrome-Original-Commit: 00668f9780a1b1c6c1b1a1f2457418d0aecf9bb5
12 files changed
tree: 90542efae8757c10fa79608dc127c52cd16f1656
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/