Move RenderSVGContainer to layout/svg/LayoutSVGContainer.

LayoutTests/svg/custom/marker-opacity-expected.txt

Index: LayoutTests/svg/custom/marker-opacity-expected.txt
diff --git a/LayoutTests/svg/custom/marker-opacity-expected.txt b/LayoutTests/svg/custom/marker-opacity-expected.txt
index 8a768e08ae58d8384996579b38d7e41cd4ae154d..3b29dba23e751e1936722a380293f05b01b6dced 100644
--- a/LayoutTests/svg/custom/marker-opacity-expected.txt
+++ b/LayoutTests/svg/custom/marker-opacity-expected.txt
@@ -11,9 +11,9 @@ layer at (0,0) size 800x600
         RenderSVGPath {path} at (1,0) size 6x5 [stroke={[type=SOLID] [color=#5555FF] [opacity=0.25] [line cap=ROUND] [line join=ROUND]}] [data="M 2 0.5 L 6 2 L 2 3.5"]
       LayoutSVGResourceMarker {marker} [id="circle2"] [markerUnits=strokeWidth] [ref at (5,5)] [angle=auto]
         RenderSVGEllipse {circle} at (0,0) size 4x4 [fill={[type=SOLID] [color=#5555FF] [opacity=0.25]}] [cx=5.00] [cy=5.00] [r=3.00]
-    RenderSVGContainer {g} at (88,63) size 306x99 [opacity=0.25]
+    LayoutSVGContainer {g} at (88,63) size 306x99 [opacity=0.25]
       RenderSVGPath {path} at (88,63) size 306x99 [stroke={[type=SOLID] [color=#5555FF] [stroke width=4.00] [line cap=ROUND]}] [start marker=circle] [end marker=arrow] [data="M 388 156 C 244 135 244 94 100 73"]
-    RenderSVGContainer {g} at (88,163) size 306x99
+    LayoutSVGContainer {g} at (88,163) size 306x99
       RenderSVGPath {path} at (88,163) size 306x99 [stroke={[type=SOLID] [color=#5555FF] [stroke width=4.00] [line cap=ROUND]}] [start marker=circle] [end marker=arrow] [data="M 388 256 C 244 235 244 194 100 173"]
-    RenderSVGContainer {g} at (88,263) size 306x99
+    LayoutSVGContainer {g} at (88,263) size 306x99
       RenderSVGPath {path} at (88,263) size 306x99 [stroke={[type=SOLID] [color=#5555FF] [opacity=0.25] [stroke width=4.00] [line cap=ROUND]}] [start marker=circle2] [end marker=arrow2] [data="M 388 356 C 244 335 244 294 100 273"]