Remove CSSCompositing

sky/engine/core/css/CSSProperties.in

 // This file specifies all the CSS properties we support and the necessary
 // information for our code generation. The various supported arguments
 // are described below with example usage
 
 
 // - alias_for=other-property
 // Properties specifying alias_for do not get their own enum and instead map
 // directly onto the CSSPropertyID they alias. Currently this means that the
 // UseCounter will not pick up on these (crbug.com/304855)
 
@@ skipping 85 matching lines @@
 -webkit-locale inherited, custom_value
 -webkit-text-orientation inherited, custom_value
 text-rendering inherited, font, type_name=TextRenderingMode
 line-height animatable, inherited, getter=specifiedLineHeight, custom_value
 
 align-content
 align-items custom_all
 align-self custom_all
 backface-visibility
 background-attachment custom_all
-background-blend-mode custom_all
 background-clip custom_all
 background-color animatable, custom_all
 background-image animatable, custom_all
 background-origin custom_all
 background-position-x animatable, custom_all
 background-position-y animatable, custom_all
 background-repeat-x custom_all
 background-repeat-y custom_all
 background-size animatable, custom_all
 border-bottom-color animatable, custom_all
@@ skipping 26 matching lines @@
 cursor inherited, custom_all
 display
 empty-cells inherited, type_name=EEmptyCell
 flex-basis animatable, converter=convertLengthOrAuto
 flex-direction
 flex-grow animatable, type_name=float
 flex-shrink animatable, type_name=float
 flex-wrap
 height animatable, initial=initialSize, converter=convertLengthSizing
 image-rendering inherited
-isolation runtime_flag=CSSCompositing
 justify-content
 left animatable, initial=initialOffset, converter=convertLengthOrAuto
 letter-spacing animatable, inherited, initial=initialLetterWordSpacing, converter=convertSpacing
 list-style-image animatable, inherited, custom_value
 list-style-position inherited
 list-style-type inherited
 margin-bottom animatable, initial=initialMargin, converter=convertLengthOrAuto
 margin-left animatable, initial=initialMargin, converter=convertLengthOrAuto
 margin-right animatable, initial=initialMargin, converter=convertLengthOrAuto
 margin-top animatable, initial=initialMargin, converter=convertLengthOrAuto
 mask-source-type runtime_flag=CSSMaskSourceType, custom_all
 max-height animatable, initial=initialMaxSize, converter=convertLengthMaxSizing
 max-width animatable, initial=initialMaxSize, converter=convertLengthMaxSizing
 min-height animatable, initial=initialMinSize, converter=convertLengthSizing
 min-width animatable, initial=initialMinSize, converter=convertLengthSizing
-mix-blend-mode runtime_flag=CSSCompositing, type_name=blink::WebBlendMode, name_for_methods=BlendMode
 object-fit runtime_flag=ObjectFitPosition, type_name=ObjectFit
 object-position runtime_flag=ObjectFitPosition, animatable, converter=convertLengthPoint
 opacity animatable, type_name=float
 order type_name=int
 orphans animatable, inherited, type_name=short, custom_all
 outline-color animatable, custom_all
 outline-offset animatable, converter=convertComputedLength<int>
 outline-style custom_all
 outline-width animatable, converter=convertLineWidth<unsigned short>
 overflow-wrap inherited
@@ skipping 230 matching lines @@
 -webkit-flex alias_for=flex
 -webkit-flex-basis alias_for=flex-basis
 -webkit-flex-direction alias_for=flex-direction
 -webkit-flex-flow alias_for=flex-flow
 -webkit-flex-grow alias_for=flex-grow
 -webkit-flex-shrink alias_for=flex-shrink
 -webkit-flex-wrap alias_for=flex-wrap
 -webkit-justify-content alias_for=justify-content
 -webkit-opacity alias_for=opacity
 -webkit-order alias_for=order