Enumerate the return value of dispatchEvent so it is clear.

third_party/WebKit/Source/core/editing/SelectionEditor.cpp

 /*
  * Copyright (C) 2004, 2008, 2009, 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 568 matching lines @@
     return granularity == LineBoundary || granularity == ParagraphBoundary || granularity == DocumentBoundary;
 }
 
 bool SelectionEditor::modify(EAlteration alter, SelectionDirection direction, TextGranularity granularity, EUserTriggered userTriggered)
 {
     if (userTriggered == UserTriggered) {
         OwnPtrWillBeRawPtr<FrameSelection> trialFrameSelection = FrameSelection::create();
         trialFrameSelection->setSelection(m_selection);
         trialFrameSelection->modify(alter, direction, granularity, NotUserTriggered);
 
-        if (trialFrameSelection->selection().isRange() && m_selection.isCaret() && !dispatchSelectStart())
+        if (trialFrameSelection->selection().isRange() && m_selection.isCaret() && dispatchSelectStart() != DispatchEventResult::NotCanceled)
             return false;
     }
 
     willBeModified(alter, direction);
 
     bool wasRange = m_selection.isRange();
     VisiblePosition originalStartPosition = m_selection.visibleStart();
     VisiblePosition position;
     switch (direction) {
     case DirectionRight:
@@ skipping 250 matching lines @@
     return true;
 }
 
 PassRefPtrWillBeRawPtr<Range> SelectionEditor::firstRange() const
 {
     if (m_logicalRange)
         return m_logicalRange->cloneRange();
     return firstRangeOf(m_selection);
 }
 
-bool SelectionEditor::dispatchSelectStart()
+DispatchEventResult SelectionEditor::dispatchSelectStart()
 {
     Node* selectStartTarget = m_selection.extent().computeContainerNode();
     if (!selectStartTarget)
-        return true;
+        return DispatchEventResult::NotCanceled;
 
     return selectStartTarget->dispatchEvent(Event::createCancelableBubble(EventTypeNames::selectstart));
 }
 
 void SelectionEditor::didChangeVisibleSelection()
 {
     ASSERT(m_observingVisibleSelection);
     // Invalidate the logical range when the underlying VisibleSelection has changed.
     if (m_logicalRange) {
         m_logicalRange->dispose();
@@ skipping 27 matching lines @@
 DEFINE_TRACE(SelectionEditor)
 {
     visitor->trace(m_frameSelection);
     visitor->trace(m_selection);
     visitor->trace(m_selectionInFlatTree);
     visitor->trace(m_logicalRange);
     VisibleSelectionChangeObserver::trace(visitor);
 }
 
 } // namespace blink