29938 Roll Fuchsia Mac SDK from x0zvww3rf… to IwEgl8xUv… (cla: yes, waiting for tree to go green)

29939 Roll Dart SDK from be01f752cbe6 to 74f6c3af2d68 (1 revision) (cla: yes, waiting for tree to go green)

29940 Fix typo and clean some includes (platform-android, cla: yes)

29941 Remove remaining usages of getUnsafe() (cla: yes, waiting for tree to go green, needs tests)

29942 Roll Dart SDK from 74f6c3af2d68 to d8a6c4d22503 (2 revisions) (cla: yes, waiting for tree to go green)