Sync ui/events to chromium @ https://codereview.chromium.org/1210203002

ui/events/gesture_detection/bitset_32.h

Index: ui/events/gesture_detection/bitset_32.h
diff --git a/ui/events/gesture_detection/bitset_32.h b/ui/events/gesture_detection/bitset_32.h
index 1cc2dadca65cfdee2b74fe3e890d275ba027c170..7b347f161d6f8150b21bd266a220e661e1c7e021 100644
--- a/ui/events/gesture_detection/bitset_32.h
+++ b/ui/events/gesture_detection/bitset_32.h
@@ -87,7 +87,7 @@ struct BitSet32 {
     return n;
   }
 
-  // Gets the inde of the specified bit in the set, which is the number of
+  // Gets the index of the specified bit in the set, which is the number of
   // marked bits that appear before the specified bit.
   inline uint32_t get_index_of_bit(uint32_t n) const {
     DCHECK_LE(n, 31U);