Move RenderSVGContainer to layout/svg/LayoutSVGContainer.

LayoutTests/platform/mac/svg/custom/empty-clip-path-expected.txt

Index: LayoutTests/platform/mac/svg/custom/empty-clip-path-expected.txt
diff --git a/LayoutTests/platform/mac/svg/custom/empty-clip-path-expected.txt b/LayoutTests/platform/mac/svg/custom/empty-clip-path-expected.txt
index c6385155511c92df604b42a9b07e0b01f5fa4578..31f63bca7d9a07c73f9de4f2cfee52fb58e95e69 100644
--- a/LayoutTests/platform/mac/svg/custom/empty-clip-path-expected.txt
+++ b/LayoutTests/platform/mac/svg/custom/empty-clip-path-expected.txt
@@ -7,13 +7,13 @@ layer at (0,0) size 800x600
       LayoutSVGResourceClipper {clipPath} [id="emptyrect"] [clipPathUnits=userSpaceOnUse]
         RenderSVGRect {rect} at (0,0) size 0x0 [fill={[type=SOLID] [color=#000000]}] [x=0.00] [y=0.00] [width=0.00] [height=0.00]
     RenderSVGRect {rect} at (0,0) size 100x100 [fill={[type=SOLID] [color=#008000]}] [x=0.00] [y=0.00] [width=100.00] [height=100.00]
-    RenderSVGContainer {g} at (0,0) size 0x0
+    LayoutSVGContainer {g} at (0,0) size 0x0
       [clipPath="nothing"] LayoutSVGResourceClipper {clipPath} at (0,0) size 0x0
       RenderSVGRect {rect} at (0,0) size 100x100 [fill={[type=SOLID] [color=#FF0000]}] [x=0.00] [y=0.00] [width=100.00] [height=100.00]
-    RenderSVGContainer {g} at (0,0) size 0x0
+    LayoutSVGContainer {g} at (0,0) size 0x0
       [clipPath="emptyrect"] LayoutSVGResourceClipper {clipPath} at (0,0) size 0x0
       RenderSVGRect {rect} at (0,0) size 100x100 [fill={[type=SOLID] [color=#FF0000]}] [x=0.00] [y=0.00] [width=100.00] [height=100.00]
-    RenderSVGContainer {g} at (0,116) size 463x38
+    LayoutSVGContainer {g} at (0,116) size 463x38
       LayoutSVGText {text} at (0,116) size 292x18 contains 1 chunk(s)
         LayoutSVGInlineText {#text} at (0,0) size 292x18
           chunk 1 text run 1 at (0.00,130.00) startOffset 0 endOffset 44 width 291.01: "Above a green rectangle should be displayed."