Move the SVG container code from rendering/svg to layout/svg.

LayoutTests/platform/win/svg/text/text-text-04-t-expected.txt

Index: LayoutTests/platform/win/svg/text/text-text-04-t-expected.txt
diff --git a/LayoutTests/platform/win/svg/text/text-text-04-t-expected.txt b/LayoutTests/platform/win/svg/text/text-text-04-t-expected.txt
index 21d2419dc2d4cb2e24522fae1e7c8dd2dd3f618f..fa5063638af135f7a3a49754bc470c6a1b0f663c 100644
--- a/LayoutTests/platform/win/svg/text/text-text-04-t-expected.txt
+++ b/LayoutTests/platform/win/svg/text/text-text-04-t-expected.txt
@@ -2,7 +2,7 @@ layer at (0,0) size 800x600
   RenderView at (0,0) size 800x600
 layer at (0,0) size 800x600
   RenderSVGRoot {svg} at (0,0) size 800x600
-    RenderSVGHiddenContainer {defs} at (0,0) size 0x0
+    LayoutSVGHiddenContainer {defs} at (0,0) size 0x0
     LayoutSVGContainer {g} at (58,36) size 699x480
       LayoutSVGContainer {g} at (58,36) size 241x38 [transform={m=((1.00,0.00)(0.00,1.00)) t=(130.00,40.00)}]
         LayoutSVGText {text} at (-95,-15) size 65x19 contains 1 chunk(s)
@@ -20,7 +20,7 @@ layer at (0,0) size 800x600
           LayoutSVGText {text} at (0,-18) size 40x23 contains 1 chunk(s)
             LayoutSVGInlineText {#text} at (0,0) size 40x23
               chunk 1 text run 1 at (0.00,0.00) startOffset 0 endOffset 4 width 40.00: "1234"
-      RenderSVGHiddenContainer {defs} at (0,0) size 0x0
+      LayoutSVGHiddenContainer {defs} at (0,0) size 0x0
         LayoutSVGRect {rect} at (0,0) size 7x7 [fill={[type=SOLID] [color=#000000]}] [x=-4.00] [y=-4.00] [width=8.00] [height=8.00]
       LayoutSVGContainer {g} at (120,103) size 247x38 [transform={m=((1.00,0.00)(0.00,1.00)) t=(130.00,80.00)}]
         LayoutSVGText {text} at (-58,-15) size 28x19 contains 1 chunk(s)