Move RenderSVGContainer to layout/svg/LayoutSVGContainer.

LayoutTests/platform/linux/svg/custom/recursive-mask-expected.txt

Index: LayoutTests/platform/linux/svg/custom/recursive-mask-expected.txt
diff --git a/LayoutTests/platform/linux/svg/custom/recursive-mask-expected.txt b/LayoutTests/platform/linux/svg/custom/recursive-mask-expected.txt
index bf3cc5be0796a400438f1b07387eaa4cbbde140b..4abb0ed7d313df0dd65206237f072d7177a0cb8d 100644
--- a/LayoutTests/platform/linux/svg/custom/recursive-mask-expected.txt
+++ b/LayoutTests/platform/linux/svg/custom/recursive-mask-expected.txt
@@ -16,7 +16,7 @@ layer at (0,0) size 800x600
       RenderSVGRect {rect} at (0,100) size 50x50 [fill={[type=SOLID] [color=#FFFFFF]}] [x=0.00] [y=100.00] [width=50.00] [height=50.00]
         [masker="mask4"] LayoutSVGResourceMasker {mask} at (0,100) size 50x50
       LayoutSVGResourceMasker {mask} [id="mask4"] [maskUnits=objectBoundingBox] [maskContentUnits=userSpaceOnUse]
-        RenderSVGContainer {use} at (0,100) size 50x50
+        LayoutSVGContainer {use} at (0,100) size 50x50
           RenderSVGRect {rect} at (0,100) size 50x50 [fill={[type=SOLID] [color=#FFFFFF]}] [x=0.00] [y=100.00] [width=50.00] [height=50.00]
             [masker="mask4"] LayoutSVGResourceMasker {mask} at (0,100) size 50x50
     RenderSVGRect {rect} at (0,0) size 50x50 [fill={[type=SOLID] [color=#0000FF]}] [x=0.00] [y=0.00] [width=100.00] [height=100.00]
@@ -31,7 +31,7 @@ layer at (0,0) size 800x600
     LayoutSVGText {text} at (37,185) size 276x19 contains 1 chunk(s)
       LayoutSVGInlineText {#text} at (0,0) size 276x19
         chunk 1 (middle anchor) text run 1 at (37.00,200.00) startOffset 0 endOffset 48 width 276.00: "Both sides of the red line should look identical"
-    RenderSVGContainer {g} at (200,0) size 150x150 [transform={m=((1.00,0.00)(0.00,1.00)) t=(200.00,0.00)}]
+    LayoutSVGContainer {g} at (200,0) size 150x150 [transform={m=((1.00,0.00)(0.00,1.00)) t=(200.00,0.00)}]
       RenderSVGRect {rect} at (200,0) size 50x50 [fill={[type=SOLID] [color=#0000FF]}] [x=0.00] [y=0.00] [width=50.00] [height=50.00]
       RenderSVGRect {rect} at (300,0) size 50x50 [fill={[type=SOLID] [color=#0000FF]}] [x=100.00] [y=0.00] [width=50.00] [height=50.00]
       RenderSVGRect {rect} at (200,100) size 50x50 [fill={[type=SOLID] [color=#0000FF]}] [x=0.00] [y=100.00] [width=50.00] [height=50.00]