Canvas2d: fix event.region being null on mouseleave/out events

third_party/WebKit/LayoutTests/fast/canvas/canvas-hit-regions-event-test.html

Index: third_party/WebKit/LayoutTests/fast/canvas/canvas-hit-regions-event-test.html
diff --git a/third_party/WebKit/LayoutTests/fast/canvas/canvas-hit-regions-event-test.html b/third_party/WebKit/LayoutTests/fast/canvas/canvas-hit-regions-event-test.html
index d970e7857abe97f2ed0ab2d10c0b72a8bfea84b7..307e73848616aa3e979c4cfcb1feb32b43979fc4 100644
--- a/third_party/WebKit/LayoutTests/fast/canvas/canvas-hit-regions-event-test.html
+++ b/third_party/WebKit/LayoutTests/fast/canvas/canvas-hit-regions-event-test.html
@@ -109,10 +109,8 @@ async_test(function() {
     { type: 'mousemove', target: button, region: 'button' },
     { type: 'mousedown', target: button, region: 'button' },
     { type: 'mouseup', target: button, region: 'button' },
-    // TODO(zino): The expected value of region should be "button" instead of
-    // null in case of mouseout/mouseleave. Please see http://crbug.com/592992.
-    { type: 'mouseout', target: button, region: null },
-    { type: 'mouseleave', target: button, region: null },
+    { type: 'mouseout', target: button, region: 'button' },
+    { type: 'mouseleave', target: button, region: 'button' },
     { type: 'touchstart', target: button, region: 'button' },
     { type: 'touchend', target: button, region: 'button' },
   ];