Move the SVG container code from rendering/svg to layout/svg.

LayoutTests/svg/custom/painting-marker-07-f-inherit-expected.txt

Index: LayoutTests/svg/custom/painting-marker-07-f-inherit-expected.txt
diff --git a/LayoutTests/svg/custom/painting-marker-07-f-inherit-expected.txt b/LayoutTests/svg/custom/painting-marker-07-f-inherit-expected.txt
index 7cfdcad1da8647e5cafbdf2021600872fcea4ca8..5eb3e8b9d489b55c60b26bca9680aca73d55a47c 100644
--- a/LayoutTests/svg/custom/painting-marker-07-f-inherit-expected.txt
+++ b/LayoutTests/svg/custom/painting-marker-07-f-inherit-expected.txt
@@ -2,8 +2,8 @@ layer at (0,0) size 800x600
   RenderView at (0,0) size 800x600
 layer at (0,0) size 800x600
   RenderSVGRoot {svg} at (0,0) size 100x100
-    RenderSVGHiddenContainer {defs} at (0,0) size 0x0
-      RenderSVGHiddenContainer {g} at (0,0) size 0x0
+    LayoutSVGHiddenContainer {defs} at (0,0) size 0x0
+      LayoutSVGHiddenContainer {g} at (0,0) size 0x0
         LayoutSVGResourceMarker {marker} [id="testMarker"] [markerUnits=strokeWidth] [ref at (0,0)] [angle=0.00]
           LayoutSVGRect {rect} at (0,0) size 100x100 [fill={[type=SOLID] [color=#008000]}] [x=0.00] [y=0.00] [width=100.00] [height=100.00]
     LayoutSVGPath {path} at (0,0) size 100x100 [fill={[type=SOLID] [color=#000000]}] [end marker=testMarker] [data="M 10 10 L 0 0"]