Move RenderSVGContainer to layout/svg/LayoutSVGContainer.

LayoutTests/platform/mac/svg/custom/recursive-filter-expected.txt

Index: LayoutTests/platform/mac/svg/custom/recursive-filter-expected.txt
diff --git a/LayoutTests/platform/mac/svg/custom/recursive-filter-expected.txt b/LayoutTests/platform/mac/svg/custom/recursive-filter-expected.txt
index 2158db824af20cff3446bb222e5cc8d5ff02d25f..44de66809dc203a2e8c7f1df49ac6d3fbe3481ec 100644
--- a/LayoutTests/platform/mac/svg/custom/recursive-filter-expected.txt
+++ b/LayoutTests/platform/mac/svg/custom/recursive-filter-expected.txt
@@ -18,6 +18,6 @@ layer at (0,0) size 800x600
     LayoutSVGText {text} at (25,286) size 300x18 contains 1 chunk(s)
       LayoutSVGInlineText {#text} at (0,0) size 299x18
         chunk 1 (middle anchor) text run 1 at (25.69,300.00) startOffset 0 endOffset 48 width 298.62: "Both sides of the red line should look identical"
-    RenderSVGContainer {g} at (190,0) size 120x110 [transform={m=((1.00,0.00)(0.00,1.00)) t=(150.00,0.00)}]
+    LayoutSVGContainer {g} at (190,0) size 120x110 [transform={m=((1.00,0.00)(0.00,1.00)) t=(150.00,0.00)}]
       RenderSVGRect {rect} at (190,0) size 120x110 [fill={[type=SOLID] [color=#0000FF]}] [x=50.00] [y=0.00] [width=100.00] [height=100.00]
         [filter="filter0"] LayoutSVGResourceFilter {filter} at (40,-10) size 120x120