Rebaseline and remove tests from ignored-tests.txt

expectations/gm/Test-Mac10.6-MacMini4.1-GeForce320M-x86-Debug/expected-results.json

 {
   "actual-results": {
     "failed": null, 
     "failure-ignored": null, 
     "no-comparison": null, 
     "succeeded": null
   }, 
   "expected-results": {
     "3x3bitmaprect_565.png": {
       "allowed-digests": [
@@ skipping 15832 matching lines @@
       ], 
       "bugs": [
         1578
       ], 
       "reviewed-by-human": false
     }, 
     "tilemode_gradient_pdf-mac.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          6682913794993626676
+          12114185262432977992
         ]
       ], 
-      "bugs": [
-        1578
-      ], 
       "ignore-failure": true, 
-      "reviewed-by-human": false
+      "reviewed-by-human": true
     }, 
     "tilemode_gradient_pdf-poppler.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           9041357500969159453
         ]
       ], 
       "bugs": [
         1578
@@ skipping 929 matching lines @@
           7829854837061118142
         ]
       ], 
       "bugs": [
         1578
       ], 
       "reviewed-by-human": false
     }
   }
 }