Revert of Update of change event for input type number (https://codereview.chromium.org/128133002/)

Source/core/html/forms/TextFieldInputType.cpp

Index: Source/core/html/forms/TextFieldInputType.cpp
diff --git a/Source/core/html/forms/TextFieldInputType.cpp b/Source/core/html/forms/TextFieldInputType.cpp
index b7dc5cd7e552b05095da7e1d128631cfdd62a193..c0923e96bd9f85cad7ea96e07cbdced236c946ce 100644
--- a/Source/core/html/forms/TextFieldInputType.cpp
+++ b/Source/core/html/forms/TextFieldInputType.cpp
@@ -212,7 +212,6 @@ void TextFieldInputType::handleKeydownEventForSpinButton(KeyboardEvent* event)
         spinButtonStepDown();
     else
         return;
-    element().dispatchFormControlChangeEvent();
     event->setDefaultHandled();
 }
 
@@ -566,9 +565,4 @@ bool TextFieldInputType::shouldSpinButtonRespondToWheelEvents()
     return shouldSpinButtonRespondToMouseEvents() && element().focused();
 }
 
-void TextFieldInputType::spinButtonDidReleaseMouseCapture()
-{
-    element().dispatchFormControlChangeEvent();
-}
-
 } // namespace WebCore