25871 Enable avoid_escaping_inner_quotes lint (cla: yes, waiting for tree to go green)

25872 Roll Dart SDK from ee8eb0a65efa to 8c109a734bdc (1 revision) (cla: yes, waiting for tree to go green)

25873 Roll Dart SDK from 8c109a734bdc to b98a1eec5eb5 (1 revision) (cla: yes, waiting for tree to go green)

25874 Roll Dart SDK from b98a1eec5eb5 to 6ecae204598d (1 revision) (cla: yes, waiting for tree to go green)