73474 Add [pointerCount] property to Scale Gesture Details (cla: yes, f: material design, framework, waiting for tree to go green)

73486 Remove “unnecessary” imports in flutter/src/cupertino (cla: yes, f: cupertino, framework, waiting for tree to go green)

73503 Revert “Add BuildContext parameter to TextEditingController.buildTextSpan” (cla: yes, f: material design, framework)

73509 Migrate missed sample code to NNBD (cla: yes, f: material design, framework, waiting for tree to go green)

73514 Update outdated links (a: internationalization, cla: yes, f: material design, framework, team, tool, waiting for tree to go green)

73521 Revert “Add material icons golden test (#73361)” (cla: yes, f: material design, framework)