Move RenderSVGContainer to layout/svg/LayoutSVGContainer.

LayoutTests/platform/win/svg/custom/invalid-fill-expected.txt

Index: LayoutTests/platform/win/svg/custom/invalid-fill-expected.txt
diff --git a/LayoutTests/platform/win/svg/custom/invalid-fill-expected.txt b/LayoutTests/platform/win/svg/custom/invalid-fill-expected.txt
index 94580ecf5587695102727273b107f49fa03ca725..d3638b1c8b8ca923145244ce988850da69ba55c2 100644
--- a/LayoutTests/platform/win/svg/custom/invalid-fill-expected.txt
+++ b/LayoutTests/platform/win/svg/custom/invalid-fill-expected.txt
@@ -2,10 +2,10 @@ layer at (0,0) size 800x600
   RenderView at (0,0) size 800x600
 layer at (0,0) size 800x600
   RenderSVGRoot {svg} at (0,0) size 692x213
-    RenderSVGContainer {g} at (0,0) size 692x213
+    LayoutSVGContainer {g} at (0,0) size 692x213
       RenderSVGRect {rect} at (0,0) size 100x100 [fill={[type=SOLID] [color=#FF0000]}] [x=0.00] [y=0.00] [width=100.00] [height=100.00]
       RenderSVGRect {rect} at (0,0) size 100x100 [fill={[type=SOLID] [color=#FFA500]}] [x=0.00] [y=0.00] [width=100.00] [height=100.00]
-      RenderSVGContainer {g} at (10,116) size 682x97
+      LayoutSVGContainer {g} at (10,116) size 682x97
         LayoutSVGText {text} at (10,116) size 236x17 contains 1 chunk(s)
           LayoutSVGInlineText {#text} at (0,0) size 236x17
             chunk 1 text run 1 at (10.00,130.00) startOffset 0 endOffset 32 width 235.49: "The above rect should be ORANGE."