Move the remaining rendering/svg/RenderSVG* files to layout.

LayoutTests/svg/custom/xlink-custom-namespace-expected.txt

Index: LayoutTests/svg/custom/xlink-custom-namespace-expected.txt
diff --git a/LayoutTests/svg/custom/xlink-custom-namespace-expected.txt b/LayoutTests/svg/custom/xlink-custom-namespace-expected.txt
index 562706d7f3ef773e16c5aee0f06441c21f6467ee..999167e280e51c4362f4aa00bef60e99a5165413 100644
--- a/LayoutTests/svg/custom/xlink-custom-namespace-expected.txt
+++ b/LayoutTests/svg/custom/xlink-custom-namespace-expected.txt
@@ -1,10 +1,10 @@
 layer at (0,0) size 800x600
   RenderView at (0,0) size 800x600
 layer at (0,0) size 800x600
-  RenderSVGRoot {svg} at (0,0) size 200x200
+  LayoutSVGRoot {svg} at (0,0) size 200x200
     LayoutSVGResourceLinearGradient {linearGradient} [id="gradient2"] [gradientUnits=objectBoundingBox] [start=(0,0)] [end=(1,0)]
-      RenderSVGGradientStop {stop} [offset=0.00] [color=#008000]
-      RenderSVGGradientStop {stop} [offset=0.00] [color=#008000]
+      LayoutSVGGradientStop {stop} [offset=0.00] [color=#008000]
+      LayoutSVGGradientStop {stop} [offset=0.00] [color=#008000]
     LayoutSVGResourceLinearGradient {linearGradient} [id="gradient1"] [gradientUnits=objectBoundingBox] [start=(0,0)] [end=(1,0)]
     LayoutSVGRect {rect} at (0,0) size 200x200 [fill={[type=SOLID] [color=#FF0000]}] [x=0.00] [y=0.00] [width=200.00] [height=200.00]
     LayoutSVGRect {rect} at (0,0) size 200x200 [fill={[type=LINEAR-GRADIENT] [id="gradient1"]}] [x=0.00] [y=0.00] [width=200.00] [height=200.00]