Revert of Fix gamut GM to work w/serialization configs. Remove it from blacklist.

infra/bots/recipes/swarm_test.expected/recipe_with_gerrit_patch.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "\nimport sys, os\npath = sys.argv[1]\nmode = int(sys.argv[2])\nif not os.path.isdir(path):\n  if os.path.exists(path):\n    print \"%s exists but is not a dir\" % path\n    sys.exit(1)\n  os.makedirs(path, mode)\n",
       "[SLAVE_BUILD]/tmp",
       "511"
     ],
     "name": "makedirs tmp_dir",
@@ skipping 418 matching lines @@
       "gm",
       "_",
       "image-cacherator-from-ctable",
       "2ndpic-8888",
       "gm",
       "_",
       "image-cacherator-from-ctable",
       "serialize-8888",
       "gm",
       "_",
-      "image-cacherator-from-ctable"
+      "image-cacherator-from-ctable",
+      "sp-8888",
+      "gm",
+      "_",
+      "gamut",
+      "pic-8888",
+      "gm",
+      "_",
+      "gamut",
+      "lite-8888",
+      "gm",
+      "_",
+      "gamut",
+      "2ndpic-8888",
+      "gm",
+      "_",
+      "gamut",
+      "serialize-8888",
+      "gm",
+      "_",
+      "gamut"
     ],
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "SKIA_OUT": "[SLAVE_BUILD]/out"
     },
     "name": "dm"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]