Fix typo in comment.

Change-Id: I341f413487ba8c30f1edd17b0d9087e0a5e2c3c1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2228432
Commit-Queue: Tal Pressman <talp@chromium.org>
Commit-Queue: Kouhei Ueno <kouhei@chromium.org>
Auto-Submit: Tal Pressman <talp@chromium.org>
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774526}

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

@@ -150,7 +150,7 @@ class PLATFORM_EXPORT FrameSchedulerImpl : public FrameScheduler,
   void SetPageFrozenForTracing(bool frozen);
 
   // Computes the priority of |task_queue| if it is associated to this frame
-  // scheduler. Note that the main's thread policy should be upto date to
+  // scheduler. Note that the main thread's policy should be upto date to
   // compute the correct priority.
   base::sequence_manager::TaskQueue::QueuePriority ComputePriority(
       MainThreadTaskQueue* task_queue) const;