rebaselines for imageblur, imagemagnifier, and still some for gradient_radial2

expectations/gm/Test-Ubuntu12-ShuttleA-ATI5770-x86_64-Debug/expected-results.json

 {
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   "expected-results": {
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       "allowed-digests": [
@@ skipping 6945 matching lines @@
       ], 
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     "imageblur_pdf-poppler.png": {
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       "allowed-digests": [
         [
@@ skipping 105 matching lines @@
       ], 
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     "imagemagnifier_pdf-poppler.png": {
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         [
@@ skipping 1374 matching lines @@
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         1578
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     "radial_gradient2_pdf.png": {
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         [
@@ skipping 2343 matching lines @@
           4745935902621983993
         ]
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       "bugs": [
         1578
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   }
 }