Move RenderSVGContainer to layout/svg/LayoutSVGContainer.

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

Index: LayoutTests/platform/win-xp/svg/custom/invalid-fill-expected.txt
diff --git a/LayoutTests/platform/win-xp/svg/custom/invalid-fill-expected.txt b/LayoutTests/platform/win-xp/svg/custom/invalid-fill-expected.txt
index b50157fae53fd667d030dc9520df04e06cdcc302..545ad5aba1b8493170d7a98b92f934578c43747b 100644
--- a/LayoutTests/platform/win-xp/svg/custom/invalid-fill-expected.txt
+++ b/LayoutTests/platform/win-xp/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 641x214
-    RenderSVGContainer {g} at (0,0) size 641x214
+    LayoutSVGContainer {g} at (0,0) size 641x214
       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 (10,115) size 631x99
+      LayoutSVGContainer {g} at (10,115) size 631x99
         LayoutSVGText {text} at (10,115) size 226x19 contains 1 chunk(s)
           LayoutSVGInlineText {#text} at (0,0) size 226x19
             chunk 1 text run 1 at (10.00,130.00) startOffset 0 endOffset 32 width 226.00: "The above rect should be ORANGE."