Change SVG layout tree output to be more meaningful and consistent

third_party/WebKit/LayoutTests/platform/linux/svg/custom/junk-data-expected.txt

Index: third_party/WebKit/LayoutTests/platform/linux/svg/custom/junk-data-expected.txt
diff --git a/third_party/WebKit/LayoutTests/platform/linux/svg/custom/junk-data-expected.txt b/third_party/WebKit/LayoutTests/platform/linux/svg/custom/junk-data-expected.txt
index 3beeb96515825f4a581295089ee21f67b757f0a5..fe6223fa440266163b1aeeca2c1248a7ab5fd5de 100644
--- a/third_party/WebKit/LayoutTests/platform/linux/svg/custom/junk-data-expected.txt
+++ b/third_party/WebKit/LayoutTests/platform/linux/svg/custom/junk-data-expected.txt
@@ -15,8 +15,8 @@ layer at (0,0) size 785x600
           LayoutText {#text} at (0,0) size 428x22
             text run at (0,0) width 428: "Below is a rendering of the page up to the first error."
       LayoutBlockFlow (anonymous) at (0,155.88) size 769x605
-        LayoutSVGRoot {svg} at (8,171) size 185x125
-          LayoutSVGText {text} at (0,105) size 185x19 contains 1 chunk(s)
-            LayoutSVGInlineText {#text} at (0,0) size 185x19
+        LayoutSVGRoot {svg} at (0,0) size 769x600
+          LayoutSVGText {text} at (0,105) size 184.39x19 contains 1 chunk(s)
+            LayoutSVGInlineText {#text} at (0,105) size 184.39x19
               chunk 1 text run 1 at (0.00,120.00) startOffset 0 endOffset 29 width 184.40: "You should see an error above"
-          LayoutSVGRect {rect} at (8,171) size 100x101 [fill={[type=SOLID] [color=#000000]}] [x=0.00] [y=0.00] [width=100.00] [height=100.00]
+          LayoutSVGRect {rect} at (0,0) size 100x100 [fill={[type=SOLID] [color=#000000]}] [x=0.00] [y=0.00] [width=100.00] [height=100.00]