Enumerate the return value of dispatchEvent so it is clear.

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

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 #ifndef SelectionEditor_h
 #define SelectionEditor_h
 
 #include "core/editing/FrameSelection.h"
+#include "core/events/EventDispatchResult.h"
 
 namespace blink {
 
 class SelectionEditor final : public NoBaseWillBeGarbageCollectedFinalized<SelectionEditor>, public VisibleSelectionChangeObserver {
     WTF_MAKE_NONCOPYABLE(SelectionEditor);
     USING_FAST_MALLOC_WILL_BE_REMOVED(SelectionEditor);
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(SelectionEditor);
 public:
     // TODO(yosin) We should move |EAlteration| and |VerticalDirection| out
     // from |FrameSelection| class like |EUserTriggered|.
@@ skipping 64 matching lines @@
     VisiblePosition modifyMovingForward(TextGranularity);
     VisiblePosition modifyExtendingLeft(TextGranularity);
     VisiblePosition modifyExtendingBackward(TextGranularity);
     VisiblePosition modifyMovingLeft(TextGranularity);
     VisiblePosition modifyMovingBackward(TextGranularity);
 
     void startObservingVisibleSelectionChange();
     void stopObservingVisibleSelectionChangeIfNecessary();
 
     LayoutUnit lineDirectionPointForBlockDirectionNavigation(EPositionType);
-    bool dispatchSelectStart();
+    DispatchEventResult dispatchSelectStart();
 
     RawPtrWillBeMember<FrameSelection> m_frameSelection;
 
     LayoutUnit m_xPosForVerticalArrowNavigation;
     VisibleSelection m_selection;
     VisibleSelectionInFlatTree m_selectionInFlatTree;
     bool m_observingVisibleSelection;
 
     // The range specified by the user, which may not be visually canonicalized
     // (hence "logical"). This will be invalidated if the underlying
     // |VisibleSelection| changes. If that happens, this variable will
     // become |nullptr|, in which case logical positions == visible positions.
     RefPtrWillBeMember<Range> m_logicalRange;
 };
 
 } // namespace blink
 
 #endif // SelectionEditor_h