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

expectations/gm/Test-Win8-ShuttleA-HD7770-x86_64-Debug/expected-results.json

 {
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       "bugs": [
@@ skipping 5140 matching lines @@
       ], 
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       "allowed-digests": [
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         1935
@@ skipping 165 matching lines @@
       ], 
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       "bugs": [
         1935
@@ skipping 165 matching lines @@
       ], 
       "bugs": [
         1935
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     "downsamplebitmap_text_high_72.00pt_gpu.png": {
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+          7227409546001357465
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-        1935
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       "allowed-digests": [
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         1935
@@ skipping 693 matching lines @@
           "bitmap-64bitMD5", 
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-        1935
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       "allowed-digests": [
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       "bugs": [
         1935
@@ skipping 7056 matching lines @@
           "bitmap-64bitMD5", 
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     "vertices_80_pdf-poppler.png": {
       "allowed-digests": [
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       "reviewed-by-human": false
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@@ skipping 355 matching lines @@
           14019814087375927425
         ]
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       "bugs": [
         1935
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       "reviewed-by-human": false
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   }
 }