Move the SVG container code from rendering/svg to layout/svg.

LayoutTests/platform/win/svg/batik/text/textProperties-expected.txt

 layer at (0,0) size 800x600
   RenderView at (0,0) size 800x600
 layer at (0,0) size 450x500
   RenderSVGRoot {svg} at (0,0) size 448x498
-    RenderSVGHiddenContainer {defs} at (0,0) size 0x0
+    LayoutSVGHiddenContainer {defs} at (0,0) size 0x0
       LayoutSVGResourceFilter {filter} [id="gaussianBlur"] [filterUnits=userSpaceOnUse] [primitiveUnits=userSpaceOnUse]
         [feGaussianBlur stdDeviation="2.00, 2.00"]
           [SourceGraphic]
       LayoutSVGText {text} at (-23,-14) size 46x17 contains 1 chunk(s)
         LayoutSVGInlineText {#text} at (0,0) size 46x17
           chunk 1 (middle anchor) text run 1 at (-22.66,0.00) startOffset 0 endOffset 6 width 45.32: "sample"
     LayoutSVGContainer {g} at (0,36) size 432x434
       LayoutSVGText {text} at (60,36) size 330x17 contains 1 chunk(s)
         LayoutSVGInlineText {#text} at (0,0) size 330x17
           chunk 1 (middle anchor) text run 1 at (60.00,50.00) startOffset 0 endOffset 47 width 330.00: "Text Alignment, Geometry, References, and Spans"
@@ skipping 100 matching lines @@
           LayoutSVGContainer {use} at (181,342) size 88x35
             LayoutSVGText {text} at (-43,-27) size 86x33 contains 1 chunk(s)
               LayoutSVGInlineText {#text} at (0,0) size 85x33
                 chunk 1 (middle anchor) text run 1 at (-42.49,0.00) startOffset 0 endOffset 6 width 84.98: "sample"
         LayoutSVGText {text} at (-45,1) size 90x17 contains 1 chunk(s)
           LayoutSVGInlineText {#text} at (0,0) size 89x17
             chunk 1 (middle anchor) text run 1 at (-44.37,15.00) startOffset 0 endOffset 14 width 88.74: "fill=\"yellow\";"
         LayoutSVGText {text} at (-76,11) size 152x17 contains 1 chunk(s)
           LayoutSVGInlineText {#text} at (0,0) size 151x17
             chunk 1 (middle anchor) text run 1 at (-75.48,25.00) startOffset 0 endOffset 21 width 150.97: "stroke=\"MidnightBlue\""
-      RenderSVGHiddenContainer {defs} at (0,0) size 0x0
+      LayoutSVGHiddenContainer {defs} at (0,0) size 0x0
         LayoutSVGResourceClipper {clipPath} [id="textClip"] [clipPathUnits=userSpaceOnUse]
           LayoutSVGText {text} at (-43,-27) size 86x33 contains 1 chunk(s)
             LayoutSVGInlineText {#text} at (0,0) size 85x33
               chunk 1 (middle anchor) text run 1 at (-42.49,0.00) startOffset 0 endOffset 6 width 84.98: "sample"
         LayoutSVGResourceLinearGradient {linearGradient} [id="gradient"] [gradientUnits=userSpaceOnUse] [start=(-50,-25)] [end=(50,25)]
           RenderSVGGradientStop {stop} [offset=0.00] [color=#0000FF]
           RenderSVGGradientStop {stop} [offset=1.00] [color=#008000]
       LayoutSVGContainer {g} at (298,345) size 104x43 [transform={m=((1.00,0.00)(0.00,1.00)) t=(350.00,370.00)}]
         LayoutSVGRect {rect} at (307,345) size 86x31 [fill={[type=LINEAR-GRADIENT] [id="gradient"]}] [x=-50.00] [y=-25.00] [width=100.00] [height=50.00]
           [clipPath="textClip"] LayoutSVGResourceClipper {clipPath} at (-42.50,-27) size 85x33
@@ skipping 15 matching lines @@
       LayoutSVGText {text} at (223,441) size 154x17 contains 1 chunk(s)
         LayoutSVGInlineText {#text} at (0,0) size 153x17
           chunk 1 (middle anchor) text run 1 at (223.64,455.00) startOffset 0 endOffset 23 width 152.73: "stroke-linejoin=\"round\""
       LayoutSVGText {text} at (224,451) size 152x17 contains 1 chunk(s)
         LayoutSVGInlineText {#text} at (0,0) size 151x17
           chunk 1 (middle anchor) text run 1 at (224.98,465.00) startOffset 0 endOffset 22 width 150.04: "stroke-linecap=\"round\""
     LayoutSVGContainer {use} at (0,0) size 448x498
       LayoutSVGContainer {g} at (0,0) size 448x498
         LayoutSVGRect {rect} at (0,0) size 448x498 [stroke={[type=SOLID] [color=#000000]}] [x=1.00] [y=1.00] [width=446.00] [height=496.00]
         LayoutSVGContainer {g} at (418,466) size 28x30 [transform={m=((1.00,0.00)(0.00,1.00)) t=(418.00,467.00)}]
-          RenderSVGViewportContainer {svg} at (418,466) size 28x30
+          LayoutSVGViewportContainer {svg} at (418,466) size 28x30
             LayoutSVGPath {path} at (418,468) size 14x19 [fill={[type=SOLID] [color=#6666FF]}] [data="M 172 44 C 137 60 31 135 11 199 C 3 226 33 247 55 232 C 14 306 -1 332 0 356 C 0 370 13 398 44 383 C 52 379 79 358 96 342 C 110 341 120 331 138 314 C 155 328 174 324 190 307 C 212 309 272 229 234 199 C 231 175 204 162 181 181 C 175 179 168 180 163 182 C 185 147 206 100 212 77 C 219 47 188 36 172 44 Z"]
             LayoutSVGPath {path} at (432,466) size 14x17 [fill={[type=SOLID] [color=#FF0000]}] [data="M 400 0 C 382 3 351 31 351 31 C 322 54 308 89 323 126 C 310 140 294 170 294 193 C 294 221 314 245 344 222 C 351 230 365 238 381 227 C 376 256 384 275 407 276 C 408 286 420 307 443 293 C 459 283 501 254 522 237 C 547 214 547 143 504 148 C 537 89 501 52 477 64 C 467 68 431 89 425 94 C 424 87 420 82 414 80 C 436 45 436 -5 401 0 Z"]
             LayoutSVGPath {path} at (425,484) size 16x12 [fill={[type=SOLID] [color=#33CC33]}] [data="M 275 353 C 229 365 187 396 161 444 C 152 460 167 481 186 477 C 172 501 146 544 171 558 C 199 574 223 550 231 543 C 249 564 281 553 312 526 C 353 540 380 524 415 473 C 423 461 445 430 445 408 C 445 392 430 378 410 387 C 409 375 401 349 357 368 C 347 362 326 363 303 385 C 308 375 300 347 275 353 Z"]