rebaseline some more: imageblur, imagemagnification, and yet more gradient_radial2

expectations/gm/Test-Mac10.7-MacMini4.1-GeForce320M-x86-Debug/expected-results.json

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@@ skipping 9767 matching lines @@
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@@ skipping 157 matching lines @@
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@@ skipping 5351 matching lines @@
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 }