Remove setting cancelBubble to false.

third_party/WebKit/Source/core/events/Event.cpp

Index: third_party/WebKit/Source/core/events/Event.cpp
diff --git a/third_party/WebKit/Source/core/events/Event.cpp b/third_party/WebKit/Source/core/events/Event.cpp
index 3c9428ad35de9d91b75fd4c960f8ae9597d4369d..0f93a0316fb59cbc1f85c4897710f77e63225e9e 100644
--- a/third_party/WebKit/Source/core/events/Event.cpp
+++ b/third_party/WebKit/Source/core/events/Event.cpp
@@ -25,6 +25,7 @@
 #include "core/dom/StaticNodeList.h"
 #include "core/events/EventDispatchMediator.h"
 #include "core/events/EventTarget.h"
+#include "core/frame/Deprecation.h"
 #include "core/frame/HostsUsingFeatures.h"
 #include "core/frame/UseCounter.h"
 #include "core/svg/SVGElement.h"
@@ -87,7 +88,6 @@ Event::Event(const AtomicString& eventType,
       m_immediatePropagationStopped(false),
       m_defaultPrevented(false),
       m_defaultHandled(false),
-      m_cancelBubble(false),
       m_wasInitialized(true),
       m_isTrusted(false),
       m_preventDefaultCalledOnUncancelableEvent(false),
@@ -337,11 +337,12 @@ double Event::timeStamp(ScriptState* scriptState) const {
 }
 
 void Event::setCancelBubble(ExecutionContext* context, bool cancel) {
-  if (!m_cancelBubble && cancel)
-    UseCounter::count(context, UseCounter::EventCancelBubbleWasChangedToTrue);
-  else if (m_cancelBubble && !cancel)
-    UseCounter::count(context, UseCounter::EventCancelBubbleWasChangedToFalse);
-  m_cancelBubble = cancel;
+  if (cancel) {
+    m_propagationStopped = true;
+  } else {
+    Deprecation::countDeprecation(
+        context, UseCounter::EventCancelBubbleWasChangedToFalse);
+  }
 }
 
 DEFINE_TRACE(Event) {