Remove text-combine.

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 272 matching lines @@
 -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-print-color-adjust inherited, type_name=PrintColorAdjust
 -webkit-rtl-ordering inherited, type_name=Order, setter=setRTLOrdering, initial=initialRTLOrdering
 -webkit-tap-highlight-color inherited, converter=convertColor
--webkit-text-combine inherited, type_name=TextCombine
 -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
 -webkit-text-stroke-color animatable, inherited, custom_all
 -webkit-text-stroke-width inherited, converter=convertTextStrokeWidth
 -webkit-transform use_handlers_for=CSSPropertyTransform
 -webkit-transform-origin-x converter=convertLength
 -webkit-transform-origin-y converter=convertLength
 -webkit-transform-origin-z converter=convertComputedLength<float>
@@ skipping 114 matching lines @@
 -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
 -webkit-transition longhands=-webkit-transition-property;-webkit-transition-duration;-webkit-transition-timing-function;-webkit-transition-delay
 
 // Aliases; these map to the same CSSPropertyID
 
 -epub-caption-side alias_for=caption-side
--epub-text-combine alias_for=-webkit-text-combine
 -epub-text-emphasis alias_for=-webkit-text-emphasis
 -epub-text-emphasis-color alias_for=-webkit-text-emphasis-color
 -epub-text-emphasis-style alias_for=-webkit-text-emphasis-style
 -epub-text-orientation alias_for=-webkit-text-orientation
 -epub-word-break alias_for=word-break
 -webkit-align-content alias_for=align-content
 -webkit-align-items alias_for=align-items
 -webkit-align-self alias_for=align-self
 -webkit-border-bottom-left-radius alias_for=border-bottom-left-radius
 -webkit-border-bottom-right-radius alias_for=border-bottom-right-radius
 -webkit-border-top-left-radius alias_for=border-top-left-radius
 -webkit-border-top-right-radius alias_for=border-top-right-radius
 -webkit-box-sizing alias_for=box-sizing
 -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
 -webkit-shape-image-threshold alias_for=shape-image-threshold
 -webkit-shape-margin alias_for=shape-margin
 -webkit-shape-outside alias_for=shape-outside