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

expectations/gm/Test-Win7-ShuttleA-HD2000-x86-Debug-ANGLE/expected-results.json

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@@ skipping 9277 matching lines @@
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@@ skipping 149 matching lines @@
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@@ skipping 5112 matching lines @@
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