Revert of Rebaseline imagemagnifier and dropshadowimagefilter tests.

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

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@@ skipping 5414 matching lines @@
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@@ skipping 3029 matching lines @@
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@@ skipping 5156 matching lines @@
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