Remove deprecated method/class in internal packages

• Type: Story
• Status: In Review
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: None
• Fix Version/s: Master
• Component/s: Core Infrastructure
• Labels:
  • pt-app-security-review
• Git Pull Request: https://github.com/shuyangzhou/liferay-portal/pull/7744

We do not need to deprecate method/class in internal packages cause it won't be exported.