Move RenderSVGContainer to layout/svg/LayoutSVGContainer.

LayoutTests/platform/win-xp/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 (28,8) size 757x490
+    LayoutSVGContainer {g} at (28,8) size 757x490
       LayoutSVGText {text} at (25,5) size 407x19 contains 1 chunk(s)
         LayoutSVGInlineText {#text} at (0,0) size 407x19
           chunk 1 text run 1 at (25.00,20.00) startOffset 0 endOffset 60 width 406.20: "Basics of tspan: changing visual properties and positioning."
-      RenderSVGContainer {g} at (78,81) size 520x134
+      LayoutSVGContainer {g} at (78,81) size 520x134
         LayoutSVGText {text} at (74,48) size 154x20 contains 1 chunk(s)
           LayoutSVGInlineText {#text} at (0,0) size 53x19
             chunk 1 text run 1 at (74.00,63.75) startOffset 0 endOffset 7 width 52.80: "You are"
           RenderSVGTSpan {tspan} at (0,0) size 34x19
             LayoutSVGInlineText {#text} at (52,0) size 33x18
               chunk 1 text run 1 at (126.80,63.75) startOffset 0 endOffset 5 width 33.00: " not "
           LayoutSVGInlineText {#text} at (85,0) size 68x19
             chunk 1 text run 1 at (159.80,63.75) startOffset 0 endOffset 9 width 67.80: "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 (65,75) size 199x20 contains 1 chunk(s)
           LayoutSVGInlineText {#text} at (0,0) size 199x19
             chunk 1 text run 1 at (65.25,90.75) startOffset 0 endOffset 29 width 198.60: "Text: \"You are not a banana.\""
         LayoutSVGText {text} at (65,93) size 276x19 contains 1 chunk(s)
           LayoutSVGInlineText {#text} at (0,0) size 275x19
             chunk 1 text run 1 at (65.25,108.00) startOffset 0 endOffset 43 width 274.80: "'tspan' changes visual attributes of \"not\","
         LayoutSVGText {text} at (65,110) size 83x19 contains 1 chunk(s)
           LayoutSVGInlineText {#text} at (0,0) size 83x19
             chunk 1 text run 1 at (65.25,125.25) startOffset 0 endOffset 13 width 82.20: "to red, bold."
-      RenderSVGContainer {g} at (374,214) size 411x175
+      LayoutSVGContainer {g} at (374,214) size 411x175
         LayoutSVGText {text} at (257,128) size 170x45 contains 1 chunk(s)
           LayoutSVGInlineText {#text} at (0,10) size 52x19
             chunk 1 text run 1 at (257.50,153.75) startOffset 0 endOffset 7 width 51.00: "But you"
           RenderSVGTSpan {tspan} at (0,0) size 23x18
             LayoutSVGInlineText {#text} at (83,0) size 23x18
               chunk 1 text run 1 at (340.50,143.00) startOffset 0 endOffset 3 width 22.80: "are"
           RenderSVGTSpan {tspan} at (0,0) size 65x20
             LayoutSVGInlineText {#text} at (105,24) size 64x19
               chunk 1 text run 1 at (363.30,168.50) startOffset 0 endOffset 9 width 63.60: " 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 190x19 contains 1 chunk(s)
           LayoutSVGInlineText {#text} at (0,0) size 190x19
             chunk 1 text run 1 at (238.00,195.00) startOffset 0 endOffset 28 width 189.60: "Text: \"But you are a peach!\""
         LayoutSVGText {text} at (238,197) size 221x19 contains 1 chunk(s)
           LayoutSVGInlineText {#text} at (0,0) size 221x19
             chunk 1 text run 1 at (238.00,212.25) startOffset 0 endOffset 34 width 220.20: "Using dx,dy, 'tspan' raises \"are\","
         LayoutSVGText {text} at (238,214) size 168x20 contains 1 chunk(s)
           LayoutSVGInlineText {#text} at (0,0) size 168x19
             chunk 1 text run 1 at (238.00,229.50) startOffset 0 endOffset 25 width 167.40: "'tspan' lowers \"a peach!\""
-      RenderSVGContainer {g} at (28,308) size 562x190
+      LayoutSVGContainer {g} at (28,308) size 562x190
         LayoutSVGText {text} at (35,185) size 145x50 contains 1 chunk(s)
           RenderSVGTSpan {tspan} at (0,0) size 145x19
             LayoutSVGInlineText {#text} at (0,0) size 145x19
               chunk 1 text run 1 at (35.00,200.00) startOffset 0 endOffset 1 width 11.40: "C"
               chunk 1 text run 1 at (53.75,200.00) startOffset 0 endOffset 1 width 8.40: "u"
               chunk 1 text run 1 at (72.50,200.00) startOffset 0 endOffset 1 width 4.20: "t"
               chunk 1 text run 1 at (91.25,200.00) startOffset 0 endOffset 1 width 8.40: "e"
               chunk 1 text run 1 at (110.50,200.00) startOffset 0 endOffset 1 width 4.20: " "
               chunk 1 text run 1 at (128.75,200.00) startOffset 0 endOffset 1 width 8.40: "a"
               chunk 1 text run 1 at (147.50,200.00) startOffset 0 endOffset 1 width 8.40: "n"
@@ skipping 16 matching lines @@
             chunk 1 text run 1 at (25.25,275.25) startOffset 0 endOffset 45 width 309.00: "'tspan' char-by-char placement of \"Cute and\","
         LayoutSVGText {text} at (25,277) size 252x20 contains 1 chunk(s)
           LayoutSVGInlineText {#text} at (0,0) size 251x19
             chunk 1 text run 1 at (25.25,292.50) startOffset 0 endOffset 39 width 250.80: "'tspan' char-by-char \"fuzzy\", below it."
     LayoutSVGText {text} at (10,304) size 260x46 contains 1 chunk(s)
       LayoutSVGInlineText {#text} at (0,0) size 260x45
         chunk 1 text run 1 at (10.00,340.00) startOffset 0 endOffset 16 width 259.80: "$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