The old all caps names for constants in the SDK have been deprecated in favor of camel case versions. This issue tracks the removal of the of old deprecated names.

TODO:

• Implement tooling Implement tooling for migrating code away from deprecated Dart 1.0 constant names #31822
• Follow up on breaking change announcement
• Clean up flutter and internal package dependencies
  • Remove uses of deprecated constants from packages used by flutter and internal code  #32749
• Clean up flutter code (if required)
• Clean up internal code
• Remove deprecated constants

This is part of the larger Dart 2.0 corelib changes tracked here: #31812 .