Rebaseline imagemagnifier and dropshadowimagefilter tests.

expectations/gm/Test-Win7-ShuttleA-HD2000-x86_64-Debug/expected-results.json

 {
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     "failed": null, 
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   }, 
   "expected-results": {
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       "allowed-digests": [
@@ skipping 5414 matching lines @@
       ], 
       "bugs": [
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       "allowed-digests": [
         [
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     "dropshadowimagefilter_pdf-poppler.png": {
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@@ skipping 3029 matching lines @@
         [
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     }, 
     "imagemagnifier_565.png": {
       "allowed-digests": [
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     "imagemagnifier_gpu.png": {
       "allowed-digests": [
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           "bitmap-64bitMD5", 
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     }, 
     "imagemagnifier_pdf-poppler.png": {
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         ]
@@ skipping 5156 matching lines @@
       "allowed-digests": [
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       "reviewed-by-human": true
     }
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 }