Remove 'flash' extension from Editor configurations

• Type: Task
• Status: Closed
• Priority: Minor
• Resolution: Completed
• Affects Version/s: None
• Fix Version/s: Master
• Component/s: JS APIs and Utilities, Alloy Editor, CKEditor, TinyMCE Editor
• Labels: None
• Epic Link: fi-remove-flash-support
• Sprint: S04E01 - The Joshua Tree
• Git Pull Request: https://github.com/liferay-frontend/liferay-portal/pull/428

CKEditor has a default Flash Dialog extension to add and preview Adobe Flash movies.

The goal of this task is to *remove our usages of the CKEditor flash plugin".

Acceptance Criteria

• The flash plugin is not used to configure an editor by default

Test Plan

• Execute git grep flash *ConfigContributor.java to find usages of the plugin