Enumerate the return value of dispatchEvent so it is clear.

third_party/WebKit/Source/modules/indexeddb/IDBRequest.cpp

Index: third_party/WebKit/Source/modules/indexeddb/IDBRequest.cpp
diff --git a/third_party/WebKit/Source/modules/indexeddb/IDBRequest.cpp b/third_party/WebKit/Source/modules/indexeddb/IDBRequest.cpp
index f7f5dc782f6dc5576e9e1cb709d945119c05d755..009c0500666cc62369368d0c4c40c1ce0971f814 100644
--- a/third_party/WebKit/Source/modules/indexeddb/IDBRequest.cpp
+++ b/third_party/WebKit/Source/modules/indexeddb/IDBRequest.cpp
@@ -411,11 +411,11 @@ ExecutionContext* IDBRequest::executionContext() const
     return ActiveDOMObject::executionContext();
 }
 
-bool IDBRequest::dispatchEventInternal(PassRefPtrWillBeRawPtr<Event> event)
+WebInputEventResult IDBRequest::dispatchEventInternal(PassRefPtrWillBeRawPtr<Event> event)
 {
     IDB_TRACE("IDBRequest::dispatchEvent");
     if (m_contextStopped || !executionContext())
-        return false;
+        return WebInputEventResult::HandledSuppressed;
     ASSERT(m_readyState == PENDING);
     ASSERT(m_hasPendingActivity);
     ASSERT(m_enqueuedEvents.size());
@@ -458,7 +458,7 @@ bool IDBRequest::dispatchEventInternal(PassRefPtrWillBeRawPtr<Event> event)
     if (setTransactionActive)
         m_transaction->setActive(true);
 
-    bool dontPreventDefault = IDBEventDispatcher::dispatch(event.get(), targets);

[jsbell, 2015/12/03 00:46:18]

Very happy to see this going away. :)

[dtapuska, 2015/12/03 02:00:53]

Thanks for the happiness :-)

+    WebInputEventResult eventResult = IDBEventDispatcher::dispatch(event.get(), targets);
 
     if (m_transaction) {
         if (m_readyState == DONE)
@@ -466,7 +466,7 @@ bool IDBRequest::dispatchEventInternal(PassRefPtrWillBeRawPtr<Event> event)
 
         // Possibly abort the transaction. This must occur after unregistering (so this request
         // doesn't receive a second error) and before deactivating (which might trigger commit).
-        if (event->type() == EventTypeNames::error && dontPreventDefault && !m_requestAborted) {
+        if (event->type() == EventTypeNames::error && eventResult == WebInputEventResult::NotHandled && !m_requestAborted) {
             m_transaction->setError(m_error);
             m_transaction->abort(IGNORE_EXCEPTION);
         }
@@ -484,7 +484,7 @@ bool IDBRequest::dispatchEventInternal(PassRefPtrWillBeRawPtr<Event> event)
     if (m_readyState == DONE && event->type() != EventTypeNames::upgradeneeded)
         m_hasPendingActivity = false;
 
-    return dontPreventDefault;
+    return eventResult;
 }
 
 void IDBRequest::uncaughtExceptionInEventHandler()