Update fontMgr expectations for Mac/Linux/Windows

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

 {
   "expected-results": {
     "3x3bitmaprect_565.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           12831071530564277917
         ]
       ], 
       "bugs": [
@@ skipping 6706 matching lines @@
           "bitmap-64bitMD5", 
           17393608634102982914
         ]
       ], 
       "reviewed-by-human": true
     }, 
     "fontmgr_iter_gpu.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          12597034011705626703
+          17393608634102982914
         ]
       ], 
       "reviewed-by-human": true
     }, 
     "fontmgr_match_565.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           2085580649669581585
         ]
@@ skipping 6448 matching lines @@
           14019814087375927425
         ]
       ], 
       "bugs": [
         1935
       ], 
       "reviewed-by-human": false
     }
   }
 }