Use alias_for with trivial property aliases

LayoutTests/fast/css/getComputedStyle/computed-style-without-renderer-expected.txt

 Computed style of an element whose parent's 'display' value is 'none':
 background-attachment: scroll
 background-clip: border-box
 background-color: rgb(0, 128, 0)
 background-image: none
 background-origin: padding-box
 background-position: 0% 0%
 background-repeat: repeat
 background-size: auto
 border-bottom-color: rgb(0, 0, 0)
@@ skipping 96 matching lines @@
 zoom: 1
 -webkit-animation-delay: 0s
 -webkit-animation-direction: normal
 -webkit-animation-duration: 0s
 -webkit-animation-fill-mode: none
 -webkit-animation-iteration-count: 1
 -webkit-animation-name: none
 -webkit-animation-play-state: running
 -webkit-animation-timing-function: ease
 -webkit-appearance: none
--webkit-backface-visibility: visible
 -webkit-background-clip: border-box
 -webkit-background-composite: source-over
 -webkit-background-origin: padding-box
 -webkit-background-size: auto
 -webkit-border-horizontal-spacing: 0px
 -webkit-border-image: none
 -webkit-border-vertical-spacing: 0px
 -webkit-box-align: stretch
 -webkit-box-decoration-break: slice
 -webkit-box-direction: normal
 -webkit-box-flex: 0
 -webkit-box-flex-group: 1
 -webkit-box-lines: single
 -webkit-box-ordinal-group: 1
 -webkit-box-orient: horizontal
 -webkit-box-pack: start
 -webkit-box-reflect: none
--webkit-box-shadow: none
 -webkit-column-break-after: auto
 -webkit-column-break-before: auto
 -webkit-column-break-inside: auto
 -webkit-column-count: auto
 -webkit-column-gap: normal
 -webkit-column-rule-color: rgb(0, 0, 0)
 -webkit-column-rule-style: none
 -webkit-column-rule-width: 0px
 -webkit-column-span: none
 -webkit-column-width: auto
@@ skipping 20 matching lines @@
 -webkit-mask-box-image-width: auto
 -webkit-mask-clip: border-box
 -webkit-mask-composite: source-over
 -webkit-mask-image: none
 -webkit-mask-origin: border-box
 -webkit-mask-position: 0% 0%
 -webkit-mask-repeat: repeat
 -webkit-mask-size: auto
 order: 0
 -webkit-perspective: none
--webkit-perspective-origin: 50% 50%
 -webkit-print-color-adjust: economy
 -webkit-rtl-ordering: logical
 -webkit-text-combine: none
 -webkit-text-decorations-in-effect: none
 -webkit-text-emphasis-color: rgb(0, 0, 0)
 -webkit-text-emphasis-position: over
 -webkit-text-emphasis-style: none
 -webkit-text-fill-color: rgb(0, 0, 0)
 -webkit-text-orientation: vertical-right
 -webkit-text-security: none
 -webkit-text-stroke-color: rgb(0, 0, 0)
 -webkit-text-stroke-width: 0px
 -webkit-transform: none
--webkit-transform-origin: 50% 50%
--webkit-transform-style: flat
 -webkit-transition-delay: 0s
 -webkit-transition-duration: 0s
 -webkit-transition-property: all
 -webkit-transition-timing-function: ease
 -webkit-user-drag: auto
 -webkit-user-modify: read-only
 -webkit-user-select: text
 -webkit-writing-mode: horizontal-tb
 clip-path: none
 clip-rule: nonzero
@@ skipping 45 matching lines @@
 height: 100px
 margin-left: 350px
 width: 350px
 
 After changing the parent's 'display' property back to 'none':
 height: 100px
 margin-left: auto
 width: 50%