Take care of a bunch of pending GPU rebaselines and remove tests from ignored-tests.txt

expectations/gm/Test-Win8-ShuttleA-GTX660-x86-Debug/expected-results.json

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@@ skipping 228 matching lines @@
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@@ skipping 228 matching lines @@
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@@ skipping 993 matching lines @@
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@@ skipping 5026 matching lines @@
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@@ skipping 522 matching lines @@
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