Return computed style for width/height for non-root SVG

third_party/WebKit/LayoutTests/svg/css/getComputedStyle-listing-expected.txt

 This test documents all computed styles on an SVG rect element.
 
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
 -webkit-app-region: no-drag
 -webkit-appearance: none
 -webkit-background-clip: border-box
 -webkit-background-origin: padding-box
 -webkit-border-horizontal-spacing: 0px
@@ skipping 156 matching lines @@
 grid-auto-rows: auto
 grid-column-end: auto
 grid-column-gap: 0px
 grid-column-start: auto
 grid-row-end: auto
 grid-row-gap: 0px
 grid-row-start: auto
 grid-template-areas: none
 grid-template-columns: none
 grid-template-rows: none
-height: auto
+height: 100px
 hyphens: manual
 image-orientation: 0deg
 image-rendering: auto
 isolation: auto
 justify-content: normal
 justify-items: normal
 justify-self: normal
 left: auto
 letter-spacing: normal
 lighting-color: rgb(255, 255, 255)
@@ skipping 102 matching lines @@
 transition-property: all
 transition-timing-function: ease
 translate: none
 unicode-bidi: normal
 user-select: text
 vector-effect: none
 vertical-align: baseline
 visibility: visible
 white-space: normal
 widows: 2
-width: auto
+width: 100px
 will-change: auto
 word-break: normal
 word-spacing: 0px
 word-wrap: normal
 writing-mode: horizontal-tb
 x: 0px
 y: 0px
 z-index: auto
 zoom: 1
 PASS successfullyParsed is true
 
 TEST COMPLETE