Change event isn't firing when the user reverts the value of a color/date/time input after JS cha…

Source/core/html/shadow/SliderThumbElement.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 238 matching lines @@
 }
 
 void SliderThumbElement::setPositionFromPoint(const LayoutPoint& point)
 {
     RefPtr<HTMLInputElement> input(hostInput());
     Element* trackElement = input->userAgentShadowRoot()->getElementById(ShadowElementNames::sliderTrack());
 
     if (!input->renderer() || !renderBox() || !trackElement->renderBox())
         return;
 
-    input->setTextAsOfLastFormControlChangeEvent(input->value());
     LayoutPoint offset = roundedLayoutPoint(input->renderer()->absoluteToLocal(point, UseTransforms));
     bool isVertical = hasVerticalAppearance(input.get());
     bool isLeftToRightDirection = renderBox()->style()->isLeftToRightDirection();
     LayoutUnit trackSize;
     LayoutUnit position;
     LayoutUnit currentPosition;
     // We need to calculate currentPosition from absolute points becaue the
     // renderer for this node is usually on a layer and renderBox()->x() and
     // y() are unusable.
     // FIXME: This should probably respect transforms.
@@ skipping 197 matching lines @@
     case MediaVolumeSliderThumbPart:
     case MediaFullScreenVolumeSliderPart:
     case MediaFullScreenVolumeSliderThumbPart:
         return mediaSliderContainer;
     default:
         return sliderContainer;
     }
 }
 
 }