-webkit-border-radius property is not dumped properly.
For example, check the test fast/borders/borderRadiusDashed01.html dump:

layer at (0,0) size 800x600
  RenderView at (0,0) size 800x600
layer at (0,0) size 800x600
  RenderBlock {HTML} at (0,0) size 800x600
    RenderBody {BODY} at (8,8) size 784x584
      RenderBlock {DIV} at (0,0) size 212x212 [bgcolor=#00FF00] [border: (6px dashed #FF0000)]
        RenderText {#text} at (6,6) size 5x17
          text run at (6,6) width 5: " "


No information about border radius is dumped.

Tests affected by this issue are now excluded from further runs.