c2787e1cf4
This removes the LegacyVariableDeclaration and VariableInitializationBase classes to create a simpler hierarchy. This is done preparation for splitting variables from statements. TEST=existing Change-Id: If29c9eee1e3d8bed819ce53ed178c3efa3bffaea Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/501961 Reviewed-by: Alexander Markov <alexmarkov@google.com> Commit-Queue: Johnni Winther <johnniwinther@google.com> Reviewed-by: Chloe Stefantsova <cstefantsova@google.com>