Revert of Rebaseline imagemagnifier and dropshadowimagefilter tests.

expectations/gm/Test-Win8-ShuttleA-GTX660-x86_64-Debug/expected-results.json

 {
   "expected-results": {
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       "bugs": [
@@ skipping 8213 matching lines @@
       ], 
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         1935
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         [
           "bitmap-64bitMD5", 
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     "dropshadowimagefilter_pdf-poppler.png": {
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@@ skipping 4717 matching lines @@
         [
           "bitmap-64bitMD5", 
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       ]
     }, 
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     "imagemagnifier_pdf-poppler.png": {
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@@ skipping 7781 matching lines @@
       "allowed-digests": [
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           "bitmap-64bitMD5", 
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       "reviewed-by-human": true
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   }
 }