Rebaseline imagemagnifier and dropshadowimagefilter tests.

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

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@@ skipping 7097 matching lines @@
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@@ skipping 4157 matching lines @@
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@@ skipping 7152 matching lines @@
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