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

LayoutTests/svg/custom/text-gradient-no-content-expected.txt

Index: LayoutTests/svg/custom/text-gradient-no-content-expected.txt
diff --git a/LayoutTests/svg/custom/text-gradient-no-content-expected.txt b/LayoutTests/svg/custom/text-gradient-no-content-expected.txt
index 1135035c428ade000e6830cd88a0dc7d8dbbf0cc..5aca4ab63e2c6788f40fd763010909392c38e3ea 100644
--- a/LayoutTests/svg/custom/text-gradient-no-content-expected.txt
+++ b/LayoutTests/svg/custom/text-gradient-no-content-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 800x600
+  LayoutSVGRoot {svg} at (0,0) size 800x600
     LayoutSVGResourceLinearGradient {linearGradient} [id="Gradient"] [gradientUnits=userSpaceOnUse] [start=(0,0)] [end=(800,0)]
-      RenderSVGGradientStop {stop} [offset=0.00] [color=#FF0000]
-      RenderSVGGradientStop {stop} [offset=1.00] [color=#FF0000]
+      LayoutSVGGradientStop {stop} [offset=0.00] [color=#FF0000]
+      LayoutSVGGradientStop {stop} [offset=1.00] [color=#FF0000]
     LayoutSVGRect {rect} at (0,0) size 800x600 [fill={[type=SOLID] [color=#008000]}] [x=0.00] [y=0.00] [width=800.00] [height=600.00]
     LayoutSVGText {text}
     LayoutSVGText {text}