Move RenderSVGContainer to layout/svg/LayoutSVGContainer.

LayoutTests/platform/mac/svg/custom/invalid-fill-hex-expected.txt

Index: LayoutTests/platform/mac/svg/custom/invalid-fill-hex-expected.txt
diff --git a/LayoutTests/platform/mac/svg/custom/invalid-fill-hex-expected.txt b/LayoutTests/platform/mac/svg/custom/invalid-fill-hex-expected.txt
index 21210d4cac5efef5d64d6e3876988e6ed8c75ffc..969b37d770be4b779c6b2171d5ba817fb77fed43 100644
--- a/LayoutTests/platform/mac/svg/custom/invalid-fill-hex-expected.txt
+++ b/LayoutTests/platform/mac/svg/custom/invalid-fill-hex-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 695x214
-    RenderSVGContainer {g} at (0,0) size 695x214
+    LayoutSVGContainer {g} at (0,0) size 695x214
       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 685x98
+      LayoutSVGContainer {g} at (10,116) size 685x98
         LayoutSVGText {text} at (10,116) size 236x18 contains 1 chunk(s)
           LayoutSVGInlineText {#text} at (0,0) size 236x18
             chunk 1 text run 1 at (10.00,130.00) startOffset 0 endOffset 32 width 235.49: "The above rect should be ORANGE."