Move RenderSVGContainer to layout/svg/LayoutSVGContainer.

LayoutTests/svg/custom/transformedMaskFails-expected.txt

Index: LayoutTests/svg/custom/transformedMaskFails-expected.txt
diff --git a/LayoutTests/svg/custom/transformedMaskFails-expected.txt b/LayoutTests/svg/custom/transformedMaskFails-expected.txt
index 58247736d09268215b7ae7ca6c72d57b15d9b4f2..7d4151920e7290f44c21732882a036641cab3352 100644
--- a/LayoutTests/svg/custom/transformedMaskFails-expected.txt
+++ b/LayoutTests/svg/custom/transformedMaskFails-expected.txt
@@ -4,7 +4,7 @@ layer at (0,0) size 800x600
   RenderSVGRoot {svg} at (100,100) size 100x100
     RenderSVGHiddenContainer {defs} at (0,0) size 0x0
       LayoutSVGResourceMasker {mask} [id="mask"] [maskUnits=objectBoundingBox] [maskContentUnits=userSpaceOnUse]
-        RenderSVGContainer {g} at (100,100) size 150x150 [transform={m=((1.00,0.00)(0.00,1.00)) t=(100.00,100.00)}]
+        LayoutSVGContainer {g} at (100,100) size 150x150 [transform={m=((1.00,0.00)(0.00,1.00)) t=(100.00,100.00)}]
           RenderSVGRect {rect} at (100,100) size 150x150 [fill={[type=SOLID] [color=#FFFFFF]}] [x=0.00] [y=0.00] [width=150.00] [height=150.00]
     RenderSVGRect {rect} at (100,100) size 100x100 [fill={[type=SOLID] [color=#FF0000]}] [x=100.00] [y=100.00] [width=100.00] [height=100.00]
     RenderSVGRect {rect} at (100,100) size 100x100 [fill={[type=SOLID] [color=#008000]}] [x=100.00] [y=100.00] [width=100.00] [height=100.00]