Make ThreadChecker::CalledOnValidThread() return true when called from the same task.

base/threading/thread_checker.h

Index: base/threading/thread_checker.h
diff --git a/base/threading/thread_checker.h b/base/threading/thread_checker.h
index 5b64880d83def9771e25786171585e582b1c3191..1d4eb1c7b0b00ad79dbec27d1afb0238190d8fa2 100644
--- a/base/threading/thread_checker.h
+++ b/base/threading/thread_checker.h
@@ -57,9 +57,7 @@ class ThreadCheckerDoNothing {
 // tasks posted to SingleThreadTaskRunners bound to different sequences, even if
 // the tasks happen to run on the same thread (e.g. two independent TaskRunners
 // with ExecutionMode::SINGLE_THREADED on the TaskScheduler that happen to share
-// a thread). Also, CalledOnValidThread() returns false when called from a non-
-// single-threaded task which is associated with a SequenceToken (e.g. a task
-// posted with ExecutionMode::SEQUENCED to the TaskScheduler).
+// a thread).
 //
 // In Release mode, CalledOnValidThread will always return true.
 #if DCHECK_IS_ON()