[MBI] Fix trivial mistakes on comments

Bug: 1105403
Change-Id: I87a6eca0085ac545f6bd6d514b1e557938072715
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2325297Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Minoru Chikamune <chikamune@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792604}

third_party/blink/renderer/platform/scheduler/main_thread/main_thread_scheduler_impl.h

@@ -1011,7 +1011,7 @@ class PLATFORM_EXPORT MainThreadSchedulerImpl
     }
   };
 
-  // Don't access main_thread_only_, instead use MainThreadOnly().
+  // Don't access main_thread_only_, instead use main_thread_only().
   MainThreadOnly main_thread_only_;
   MainThreadOnly& main_thread_only() {
     helper_.CheckOnValidThread();
@@ -1023,7 +1023,7 @@ class PLATFORM_EXPORT MainThreadSchedulerImpl
   }
 
   mutable base::Lock any_thread_lock_;
-  // Don't access any_thread_, instead use AnyThread().
+  // Don't access any_thread_, instead use any_thread().
   AnyThread any_thread_;
   AnyThread& any_thread() {
     any_thread_lock_.AssertAcquired();