Rebaseline imagemagnifier and dropshadowimagefilter tests.

expectations/gm/Test-Mac10.7-MacMini4.1-GeForce320M-x86_64-Release/expected-results.json

 {
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   "expected-results": {
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@@ skipping 6405 matching lines @@
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@@ skipping 3618 matching lines @@
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@@ skipping 6328 matching lines @@
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