[Extensions] Expand bindings access checks

BUG=601149
BUG=601073

Review URL: https://codereview.chromium.org/1866103002

Cr-Commit-Position: refs/heads/master@{#387710}
  explicit LanguageDetectionResult(bool is_reliable)
      : is_reliable(is_reliable) {}

  explicit LanguageDetectionResult(bool is_reliable)
      : is_reliable(is_reliable) {}
