gradtext also needed rebaselining from the gamma change

expectations/gm/Test-Ubuntu12-ShuttleA-GTX660-x86_64-Release/expected-results.json

 {
   "actual-results": {
     "failed": null, 
     "failure-ignored": null, 
     "no-comparison": null, 
     "succeeded": null
   }, 
   "expected-results": {
     "3x3bitmaprect_565.png": {
       "allowed-digests": [
@@ skipping 11772 matching lines @@
           15859984430307806446
         ]
       ], 
       "ignore-failure": false, 
       "reviewed-by-human": true
     }, 
     "gradtext_8888.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          16030985443143446115
+          5659028446842583448
         ]
       ], 
       "ignore-failure": false, 
       "reviewed-by-human": true
     }, 
     "gradtext_gpu.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          7650059225704934476
+          92511276571386922
         ]
       ], 
       "ignore-failure": false, 
       "reviewed-by-human": true
     }, 
     "gradtext_msaa16.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          1315170111548479306
+          3124201814718695673
         ]
       ], 
       "reviewed-by-human": true
     }, 
     "gradtext_nvprmsaa4.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           6404505258636913207
         ]
@@ skipping 8004 matching lines @@
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           14883391086059083985
         ]
       ], 
       "reviewed-by-human": true
     }
   }
 }