Do not dispatch 'change' events during pressing spin buttons for input[type=number].

Source/core/html/shadow/SpinButtonElement.cpp

 /*
  * Copyright (C) 2006, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google 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
@@ skipping 94 matching lines @@
                     // cancel the repeating timer by the state change. If we
                     // started the timer after doStepAction(), we would have no
                     // chance to cancel the timer.
                     startRepeatingTimer();
                     doStepAction(m_upDownState == Up ? 1 : -1);
                 }
             }
             event->setDefaultHandled();
         }
     } else if (mouseEvent->type() == EventTypeNames::mouseup && mouseEvent->button() == LeftButton) {
-        stopRepeatingTimer();
+        releaseCapture();
     } else if (event->type() == EventTypeNames::mousemove) {
         if (box->pixelSnappedBorderBoxRect().contains(local)) {
             if (!m_capturing) {
                 if (LocalFrame* frame = document().frame()) {
                     frame->eventHandler().setCapturingMouseEventsNode(this);
                     m_capturing = true;
                     if (Page* page = document().page())
                         page->chrome().registerPopupOpeningObserver(this);
                 }
             }
@@ skipping 66 matching lines @@
 {
     stopRepeatingTimer();
     if (m_capturing) {
         if (LocalFrame* frame = document().frame()) {
             frame->eventHandler().setCapturingMouseEventsNode(nullptr);
             m_capturing = false;
             if (Page* page = document().page())
                 page->chrome().unregisterPopupOpeningObserver(this);
         }
     }
+    if (m_spinButtonOwner)
+        m_spinButtonOwner->spinButtonDidReleaseMouseCapture();
+
 }
 
 bool SpinButtonElement::matchesReadOnlyPseudoClass() const
 {
     return shadowHost()->matchesReadOnlyPseudoClass();
 }
 
 bool SpinButtonElement::matchesReadWritePseudoClass() const
 {
     return shadowHost()->matchesReadWritePseudoClass();
@@ skipping 37 matching lines @@
         m_upDownState = Indeterminate;
     HTMLDivElement::setHovered(flag);
 }
 
 bool SpinButtonElement::shouldRespondToMouseEvents()
 {
     return !m_spinButtonOwner || m_spinButtonOwner->shouldSpinButtonRespondToMouseEvents();
 }
 
 }