Remove the compile time flag for DATALIST Element.

Source/core/rendering/RenderThemeChromiumMac.h

Index: Source/core/rendering/RenderThemeChromiumMac.h
diff --git a/Source/core/rendering/RenderThemeChromiumMac.h b/Source/core/rendering/RenderThemeChromiumMac.h
index 9061eb9c6665a5d77e3b7c3dec8679619ef2fc7b..be551668ac7a19c1dbcecfa75ed60816011a5c55 100644
--- a/Source/core/rendering/RenderThemeChromiumMac.h
+++ b/Source/core/rendering/RenderThemeChromiumMac.h
@@ -69,10 +69,8 @@ public:
 
     virtual void adjustSliderThumbSize(RenderStyle*, Element*) const;
 
-#if ENABLE(DATALIST_ELEMENT)
     virtual IntSize sliderTickSize() const OVERRIDE;
     virtual int sliderTickOffsetFromTrackCenter() const OVERRIDE;
-#endif
 
     virtual int popupInternalPaddingLeft(RenderStyle*) const;
     virtual int popupInternalPaddingRight(RenderStyle*) const;
@@ -212,9 +210,7 @@ private:
     virtual Color disabledTextColor(const Color& textColor, const Color&) const OVERRIDE { return textColor; }
     virtual void updateActiveState(NSCell*, const RenderObject*);
     virtual String extraDefaultStyleSheet();
-#if ENABLE(DATALIST_ELEMENT)
     virtual LayoutUnit sliderTickSnappingThreshold() const OVERRIDE;
-#endif
 #if ENABLE(INPUT_MULTIPLE_FIELDS_UI)
     virtual bool supportsCalendarPicker(const AtomicString& type) const OVERRIDE;
 #endif