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

LayoutTests/svg/custom/external-paintserver-reference-expected.txt

Index: LayoutTests/svg/custom/external-paintserver-reference-expected.txt
diff --git a/LayoutTests/svg/custom/external-paintserver-reference-expected.txt b/LayoutTests/svg/custom/external-paintserver-reference-expected.txt
index 56fb2829b0887c10cdecd3ce4a74cbb401645fc5..e36e8ab94c1b3cf36fd8263beafa30899045ce98 100644
--- a/LayoutTests/svg/custom/external-paintserver-reference-expected.txt
+++ b/LayoutTests/svg/custom/external-paintserver-reference-expected.txt
@@ -2,9 +2,9 @@ layer at (0,0) size 800x600
   RenderView at (0,0) size 800x600
 layer at (0,0) size 800x600
   RenderBlock {html} at (0,0) size 800x600
-    RenderSVGRoot {svg} at (0,0) size 100x100
+    LayoutSVGRoot {svg} at (0,0) size 100x100
       LayoutSVGHiddenContainer {defs} at (0,0) size 0x0
         LayoutSVGResourceLinearGradient {linearGradient} [id="orange_red"] [gradientUnits=objectBoundingBox] [start=(0,0)] [end=(1,0)]
-          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 100x100 [x=0.00] [y=0.00] [width=100.00] [height=100.00]