Remove -webkit-mask-*.

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
 
 
@@ skipping 139 matching lines @@
 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
 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
@@ skipping 58 matching lines @@
 -webkit-border-horizontal-spacing animatable, inherited, name_for_methods=HorizontalBorderSpacing, converter=convertComputedLength<short>
 -webkit-border-image initial=initialNinePieceImage, custom_value
 -webkit-border-vertical-spacing animatable, inherited, name_for_methods=VerticalBorderSpacing, converter=convertComputedLength<short>
 -webkit-box-decoration-break
 -webkit-box-shadow animatable, use_handlers_for=CSSPropertyBoxShadow
 -webkit-clip-path animatable, custom_value
 -webkit-highlight inherited, converter=convertString<CSSValueNone>
 -webkit-hyphenate-character inherited, name_for_methods=HyphenationString, converter=convertString<CSSValueAuto>
 -webkit-line-box-contain inherited, converter=convertLineBoxContain
 -webkit-line-break inherited, type_name=LineBreak
--webkit-mask-box-image-outset animatable, custom_all
--webkit-mask-box-image-repeat custom_all
--webkit-mask-box-image-slice animatable, custom_all
--webkit-mask-box-image-source animatable, custom_value
--webkit-mask-box-image-width animatable, custom_all
--webkit-mask-clip custom_all
--webkit-mask-composite custom_all
--webkit-mask-image animatable, custom_all
--webkit-mask-origin custom_all
--webkit-mask-position-x animatable, custom_all
--webkit-mask-position-y animatable, custom_all
--webkit-mask-repeat-x custom_all
--webkit-mask-repeat-y custom_all
--webkit-mask-size animatable, custom_all
 -webkit-perspective custom_all
 -webkit-perspective-origin custom_all
 -webkit-perspective-origin-x converter=convertLength
 -webkit-perspective-origin-y converter=convertLength
 -webkit-rtl-ordering inherited, type_name=Order, setter=setRTLOrdering, initial=initialRTLOrdering
 -webkit-tap-highlight-color inherited, converter=convertColor
 -webkit-text-emphasis-color inherited, custom_all
 -webkit-text-emphasis-position inherited, type_name=TextEmphasisPosition
 -webkit-text-emphasis-style inherited, custom_all
 -webkit-text-fill-color inherited, custom_all
@@ skipping 84 matching lines @@
 outline longhands=outline-color;outline-style;outline-width
 overflow longhands=overflow-x;overflow-y
 padding longhands=padding-top;padding-right;padding-bottom;padding-left
 animation longhands=animation-name;animation-duration;animation-timing-function;animation-delay;animation-iteration-count;animation-direction;animation-fill-mode;animation-play-state
 -webkit-border-after longhands=-webkit-border-after-width;-webkit-border-after-style;-webkit-border-after-color
 -webkit-border-before longhands=-webkit-border-before-width;-webkit-border-before-style;-webkit-border-before-color
 -webkit-border-end longhands=-webkit-border-end-width;-webkit-border-end-style;-webkit-border-end-color
 // "-webkit-border-radius: 1px 2px" behaves as "border-radius: 1px / 2px"
 -webkit-border-radius longhands=border-top-left-radius;border-top-right-radius;border-bottom-right-radius;border-bottom-left-radius
 -webkit-border-start longhands=-webkit-border-start-width;-webkit-border-start-style;-webkit-border-start-color
--webkit-mask longhands=-webkit-mask-image;-webkit-mask-position-x;-webkit-mask-position-y;-webkit-mask-size;-webkit-mask-repeat-x;-webkit-mask-repeat-y;-webkit-mask-origin;-webkit-mask-clip
--webkit-mask-box-image longhands=-webkit-mask-box-image-source;-webkit-mask-box-image-slice;-webkit-mask-box-image-width;-webkit-mask-box-image-outset;-webkit-mask-box-image-repeat
--webkit-mask-position longhands=-webkit-mask-position-x;-webkit-mask-position-y
--webkit-mask-repeat longhands=-webkit-mask-repeat-x;-webkit-mask-repeat-y
 -webkit-text-emphasis longhands=-webkit-text-emphasis-style;-webkit-text-emphasis-color
 -webkit-text-stroke longhands=-webkit-text-stroke-width;-webkit-text-stroke-color
 -webkit-transform-origin longhands=-webkit-transform-origin-x;-webkit-transform-origin-y;-webkit-transform-origin-z
 transition longhands=transition-property;transition-duration;transition-timing-function;transition-delay
 
 // Aliases; these map to the same CSSPropertyID
 
 -epub-caption-side alias_for=caption-side
 -epub-text-emphasis alias_for=-webkit-text-emphasis
 -epub-text-emphasis-color alias_for=-webkit-text-emphasis-color
@@ skipping 11 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