Revert "Use scratch keys for stencil buffers."

expectations/gm/Test-Win8-ShuttleA-GTX660-x86_64-Debug/expected-results.json

Index: expectations/gm/Test-Win8-ShuttleA-GTX660-x86_64-Debug/expected-results.json
diff --git a/expectations/gm/Test-Win8-ShuttleA-GTX660-x86_64-Debug/expected-results.json b/expectations/gm/Test-Win8-ShuttleA-GTX660-x86_64-Debug/expected-results.json
index 928a7431a9737b39039f19da56b732a56c53fbd9..bd7c44319387fe11e6c8b7998fa7f8032ac52075 100644
--- a/expectations/gm/Test-Win8-ShuttleA-GTX660-x86_64-Debug/expected-results.json
+++ b/expectations/gm/Test-Win8-ShuttleA-GTX660-x86_64-Debug/expected-results.json
@@ -7116,10 +7116,10 @@
       "allowed-digests": [
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           "bitmap-64bitMD5", 
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+          10566742216990551435
         ]
       ], 
-      "reviewed-by-human": true
+      "reviewed-by-human": false
     }, 
     "dashing2_pdf-poppler.png": {
       "allowed-digests": [
@@ -11911,10 +11911,10 @@
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          12821620961617303185
+          17326560431224736462
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       ], 
-      "reviewed-by-human": true
+      "reviewed-by-human": false
     }, 
     "glyph_pos_n_b_nvprmsaa4.png": {
       "allowed-digests": [