Rebaseline imagemagnifier and dropshadowimagefilter tests.

expectations/gm/Test-Mac10.8-MacMini4.1-GeForce320M-x86_64-Debug/expected-results.json

 {
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   "expected-results": {
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       "allowed-digests": [
@@ skipping 7013 matching lines @@
       ], 
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@@ skipping 3823 matching lines @@
           "bitmap-64bitMD5", 
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         ]
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@@ skipping 6609 matching lines @@
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 }