Chromium roll (https://codereview.chromium.org/976353002)

base/test/test_mock_time_task_runner.h

Index: base/test/test_mock_time_task_runner.h
diff --git a/base/test/test_mock_time_task_runner.h b/base/test/test_mock_time_task_runner.h
index 1a651f6f81e053945d15d4bd24b75ecda2509b91..5f06013cfa7e0253425fa329a687c50c3e19c176 100644
--- a/base/test/test_mock_time_task_runner.h
+++ b/base/test/test_mock_time_task_runner.h
@@ -32,13 +32,12 @@ class TickClock;
 //   - It allows for reentrancy, in that it handles the running of tasks that in
 //     turn call back into it (e.g., to post more tasks).
 //   - Tasks are stored in a priority queue, and executed in the increasing
-//     order of post time + delay.
+//     order of post time + delay, but ignoring nestability.
 //   - It does not check for overflow when doing time arithmetic. A sufficient
 //     condition for preventing overflows is to make sure that the sum of all
 //     posted task delays and fast-forward increments is still representable by
 //     a TimeDelta, and that adding this delta to the starting values of Time
 //     and TickTime is still within their respective range.
-//   - Non-nestable tasks are not supported.
 //   - Tasks aren't guaranteed to be destroyed immediately after they're run.
 //
 // This is a slightly more sophisticated version of TestSimpleTaskRunner, in