Fix getBBox() returning (0,0) bug when width or height is zero

LayoutTests/platform/linux/svg/custom/object-sizing-explicit-width-height-expected.txt

Index: LayoutTests/platform/linux/svg/custom/object-sizing-explicit-width-height-expected.txt
diff --git a/LayoutTests/platform/win/svg/custom/object-sizing-explicit-width-height-expected.txt b/LayoutTests/platform/linux/svg/custom/object-sizing-explicit-width-height-expected.txt
similarity index 90%
copy from LayoutTests/platform/win/svg/custom/object-sizing-explicit-width-height-expected.txt
copy to LayoutTests/platform/linux/svg/custom/object-sizing-explicit-width-height-expected.txt
index 3ded59ce372a5262c6938d8d94f23c022be30e6a..46cb8e4d8a4704178728704a9a19b1a39b1e0e85 100644
--- a/LayoutTests/platform/win/svg/custom/object-sizing-explicit-width-height-expected.txt
+++ b/LayoutTests/platform/linux/svg/custom/object-sizing-explicit-width-height-expected.txt
@@ -9,7 +9,7 @@ layer at (0,0) size 800x296
         layer at (0,0) size 175x275
           RenderSVGRoot {svg} at (0,50) size 175x175
             RenderSVGRect {rect} at (0,50) size 175x175 [fill={[type=SOLID] [color=#0000FF]}] [x=0.00] [y=0.00] [width=300.00] [height=300.00]
-            RenderSVGEllipse {circle} at (70,120) size 35x35 [fill={[type=SOLID] [color=#008000]}] [cx=150.00] [cy=150.00] [r=30.00]
+            RenderSVGEllipse {circle} at (69,119) size 37x37 [fill={[type=SOLID] [color=#008000]}] [cx=150.00] [cy=150.00] [r=30.00]
       RenderText {#text} at (175,260) size 4x19
         text run at (175,260) width 4: " "
       RenderEmbeddedObject {object} at (179,0) size 175x275 [bgcolor=#FFA500]
@@ -18,7 +18,7 @@ layer at (0,0) size 800x296
         layer at (0,0) size 175x275
           RenderSVGRoot {svg} at (0,50) size 175x175
             RenderSVGRect {rect} at (0,50) size 175x175 [fill={[type=SOLID] [color=#0000FF]}] [x=0.00] [y=0.00] [width=300.00] [height=300.00]
-            RenderSVGEllipse {circle} at (70,120) size 35x35 [fill={[type=SOLID] [color=#008000]}] [cx=150.00] [cy=150.00] [r=30.00]
+            RenderSVGEllipse {circle} at (69,119) size 37x37 [fill={[type=SOLID] [color=#008000]}] [cx=150.00] [cy=150.00] [r=30.00]
       RenderText {#text} at (354,260) size 4x19
         text run at (354,260) width 4: " "
       RenderEmbeddedObject {object} at (358,0) size 175x275 [bgcolor=#FFA500]
@@ -27,7 +27,7 @@ layer at (0,0) size 800x296
         layer at (0,0) size 175x275
           RenderSVGRoot {svg} at (0,50) size 175x175
             RenderSVGRect {rect} at (0,50) size 175x175 [fill={[type=SOLID] [color=#0000FF]}] [x=0.00] [y=0.00] [width=300.00] [height=300.00]
-            RenderSVGEllipse {circle} at (70,120) size 35x35 [fill={[type=SOLID] [color=#008000]}] [cx=150.00] [cy=150.00] [r=30.00]
+            RenderSVGEllipse {circle} at (69,119) size 37x37 [fill={[type=SOLID] [color=#008000]}] [cx=150.00] [cy=150.00] [r=30.00]
       RenderText {#text} at (533,260) size 4x19
         text run at (533,260) width 4: " "
       RenderEmbeddedObject {object} at (537,0) size 175x275 [bgcolor=#FFA500]
@@ -36,5 +36,5 @@ layer at (0,0) size 800x296
         layer at (0,0) size 175x275
           RenderSVGRoot {svg} at (0,50) size 175x175
             RenderSVGRect {rect} at (0,50) size 175x175 [fill={[type=SOLID] [color=#0000FF]}] [x=0.00] [y=0.00] [width=300.00] [height=300.00]
-            RenderSVGEllipse {circle} at (70,120) size 35x35 [fill={[type=SOLID] [color=#008000]}] [cx=150.00] [cy=150.00] [r=30.00]
+            RenderSVGEllipse {circle} at (69,119) size 37x37 [fill={[type=SOLID] [color=#008000]}] [cx=150.00] [cy=150.00] [r=30.00]
       RenderText {#text} at (0,0) size 0x0