Move RenderSVGContainer to layout/svg/LayoutSVGContainer.

LayoutTests/platform/mac/svg/text/text-tspan-01-b-expected.txt

 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
-    RenderSVGContainer {g} at (28,9) size 757x489
+    LayoutSVGContainer {g} at (28,9) size 757x489
       LayoutSVGText {text} at (25,5) size 420x19 contains 1 chunk(s)
         LayoutSVGInlineText {#text} at (0,0) size 420x18
           chunk 1 text run 1 at (25.00,20.00) startOffset 0 endOffset 60 width 419.71: "Basics of tspan: changing visual properties and positioning."
-      RenderSVGContainer {g} at (78,82) size 520x133
+      LayoutSVGContainer {g} at (78,82) size 520x133
         LayoutSVGText {text} at (74,49) size 161x19 contains 1 chunk(s)
           LayoutSVGInlineText {#text} at (0,0) size 57x18
             chunk 1 text run 1 at (74.00,63.75) startOffset 0 endOffset 7 width 56.03: "You are"
           RenderSVGTSpan {tspan} at (0,0) size 34x18
             LayoutSVGInlineText {#text} at (56,0) size 34x18
               chunk 1 text run 1 at (130.03,63.75) startOffset 0 endOffset 5 width 33.76: " not "
           LayoutSVGInlineText {#text} at (89,0) size 72x18
             chunk 1 text run 1 at (163.78,63.75) startOffset 0 endOffset 9 width 71.16: "a banana."
         RenderSVGRect {rect} at (78,122) size 520x92 [stroke={[type=SOLID] [color=#000000]}] [x=47.50] [y=74.25] [width=310.50] [height=53.50]
         LayoutSVGText {text} at (65,76) size 210x19 contains 1 chunk(s)
           LayoutSVGInlineText {#text} at (0,0) size 210x18
             chunk 1 text run 1 at (65.25,90.75) startOffset 0 endOffset 29 width 209.67: "Text: \"You are not a banana.\""
         LayoutSVGText {text} at (65,93) size 287x19 contains 1 chunk(s)
           LayoutSVGInlineText {#text} at (0,0) size 287x18
             chunk 1 text run 1 at (65.25,108.00) startOffset 0 endOffset 43 width 286.01: "'tspan' changes visual attributes of \"not\","
         LayoutSVGText {text} at (65,110) size 85x19 contains 1 chunk(s)
           LayoutSVGInlineText {#text} at (0,0) size 85x18
             chunk 1 text run 1 at (65.25,125.25) startOffset 0 endOffset 13 width 84.48: "to red, bold."
-      RenderSVGContainer {g} at (374,214) size 411x175
+      LayoutSVGContainer {g} at (374,214) size 411x175
         LayoutSVGText {text} at (257,128) size 177x45 contains 1 chunk(s)
           LayoutSVGInlineText {#text} at (0,10) size 55x18
             chunk 1 text run 1 at (257.50,153.75) startOffset 0 endOffset 7 width 54.24: "But you"
           RenderSVGTSpan {tspan} at (0,0) size 25x18
             LayoutSVGInlineText {#text} at (86,0) size 25x18
               chunk 1 text run 1 at (343.74,143.00) startOffset 0 endOffset 3 width 24.02: "are"
           RenderSVGTSpan {tspan} at (0,0) size 67x19
             LayoutSVGInlineText {#text} at (110,25) size 66x18
               chunk 1 text run 1 at (367.76,168.50) startOffset 0 endOffset 9 width 65.81: " a peach!"
         RenderSVGRect {rect} at (374,297) size 411x92 [stroke={[type=SOLID] [color=#000000]}] [x=225.00] [y=179.00] [width=245.50] [height=53.50]
         LayoutSVGText {text} at (238,180) size 199x19 contains 1 chunk(s)
           LayoutSVGInlineText {#text} at (0,0) size 199x18
             chunk 1 text run 1 at (238.00,195.00) startOffset 0 endOffset 28 width 198.97: "Text: \"But you are a peach!\""
         LayoutSVGText {text} at (238,197) size 229x19 contains 1 chunk(s)
           LayoutSVGInlineText {#text} at (0,0) size 229x18
             chunk 1 text run 1 at (238.00,212.25) startOffset 0 endOffset 34 width 228.18: "Using dx,dy, 'tspan' raises \"are\","
         LayoutSVGText {text} at (238,215) size 174x19 contains 1 chunk(s)
           LayoutSVGInlineText {#text} at (0,0) size 174x18
             chunk 1 text run 1 at (238.00,229.50) startOffset 0 endOffset 25 width 173.07: "'tspan' lowers \"a peach!\""
-      RenderSVGContainer {g} at (28,309) size 562x189
+      LayoutSVGContainer {g} at (28,309) size 562x189
         LayoutSVGText {text} at (35,185) size 145x50 contains 1 chunk(s)
           RenderSVGTSpan {tspan} at (0,0) size 145x18
             LayoutSVGInlineText {#text} at (0,0) size 145x18
               chunk 1 text run 1 at (35.00,200.00) startOffset 0 endOffset 1 width 11.55: "C"
               chunk 1 text run 1 at (53.75,200.00) startOffset 0 endOffset 1 width 8.90: "u"
               chunk 1 text run 1 at (72.50,200.00) startOffset 0 endOffset 1 width 4.44: "t"
               chunk 1 text run 1 at (91.25,200.00) startOffset 0 endOffset 1 width 8.90: "e"
               chunk 1 text run 1 at (110.50,200.00) startOffset 0 endOffset 1 width 4.44: " "
               chunk 1 text run 1 at (128.75,200.00) startOffset 0 endOffset 1 width 8.90: "a"
               chunk 1 text run 1 at (147.50,200.00) startOffset 0 endOffset 1 width 8.90: "n"
@@ skipping 16 matching lines @@
             chunk 1 text run 1 at (25.25,275.25) startOffset 0 endOffset 45 width 320.66: "'tspan' char-by-char placement of \"Cute and\","
         LayoutSVGText {text} at (25,278) size 261x19 contains 1 chunk(s)
           LayoutSVGInlineText {#text} at (0,0) size 261x18
             chunk 1 text run 1 at (25.25,292.50) startOffset 0 endOffset 39 width 260.17: "'tspan' char-by-char \"fuzzy\", below it."
     LayoutSVGText {text} at (10,304) size 264x47 contains 1 chunk(s)
       LayoutSVGInlineText {#text} at (0,0) size 264x47
         chunk 1 text run 1 at (10.00,340.00) startOffset 0 endOffset 16 width 263.31: "$Revision: 1.7 $"
     RenderSVGRect {rect} at (0,0) size 800x600 [stroke={[type=SOLID] [color=#000000]}] [x=1.00] [y=1.00] [width=478.00] [height=358.00]
 selection start: position 0 of child 0 {#text} of child 1 {text} of child 13 {g} of child 35 {svg} of document
 selection end:   position 16 of child 0 {#text} of child 15 {text} of child 35 {svg} of document