Spinner elements not to dispatch change event on hover

Source/core/html/shadow/SpinButtonElement.cpp

Index: Source/core/html/shadow/SpinButtonElement.cpp
diff --git a/Source/core/html/shadow/SpinButtonElement.cpp b/Source/core/html/shadow/SpinButtonElement.cpp
index 04e21b86af6f1ea332e91be804b0b1b0519bbc43..31b6f48bd26c05633538c5e5423e755dc1142edc 100644
--- a/Source/core/html/shadow/SpinButtonElement.cpp
+++ b/Source/core/html/shadow/SpinButtonElement.cpp
@@ -113,6 +113,8 @@ void SpinButtonElement::defaultEventHandler(Event* event)
         }
     } else if (mouseEvent->type() == EventTypeNames::mouseup && mouseEvent->button() == LeftButton) {
         releaseCapture();
+        if (m_spinButtonOwner)
+            m_spinButtonOwner->spinButtonDidReleaseMouseCapture();
     } else if (event->type() == EventTypeNames::mousemove) {
         if (box->pixelSnappedBorderBoxRect().contains(local)) {
             if (!m_capturing) {
@@ -198,8 +200,6 @@ void SpinButtonElement::releaseCapture()
             if (Page* page = document().page())
                 page->chrome().unregisterPopupOpeningObserver(this);
         }
-        if (m_spinButtonOwner)
-            m_spinButtonOwner->spinButtonDidReleaseMouseCapture();

[tkent, 2014/01/29 00:16:35]

Calling spinButtonDidReleaseMouseCapture in releaseCapture is correct though we
need to move it to outside of "if (m_capturing)". We need to dispatch 'change'
events for every callsites of releaseCapture().

I guess the root cause of the problem is
HTMLTextFormControlElement::m_textAsOfLastFormControlChangeEvent is not
initialized correctly.

     }
 }