Update fontcache expectations

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

 {
   "expected-results": {
     "3x3bitmaprect_565.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           12831071530564277917
         ]
       ], 
       "bugs": [
@@ skipping 6706 matching lines @@
           "bitmap-64bitMD5", 
           4809842658371595960
         ]
       ], 
       "reviewed-by-human": false
     }, 
     "fontcache_gpu.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          14935536508309642496
+          6898048676956000294
         ]
       ], 
       "reviewed-by-human": true
     }, 
     "fontmgr_iter_565.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           959878741858530751
         ]
@@ skipping 7291 matching lines @@
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           10845440994435344847
         ]
       ], 
       "reviewed-by-human": false
     }
   }
 }