Rebaseline imagemagnifier and dropshadowimagefilter tests.

expectations/gm/Test-Mac10.6-MacMini4.1-GeForce320M-x86_64-Release/expected-results.json

 {
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   "expected-results": {
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       "allowed-digests": [
@@ skipping 6029 matching lines @@
       ], 
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@@ skipping 3568 matching lines @@
           "bitmap-64bitMD5", 
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     "imagemagnifier_pdf-mac.png": {
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@@ skipping 6175 matching lines @@
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 }