Extend chromium_tests trigger to work across masters.

scripts/slave/recipes/chromium.expected/full_chromium_gpu_fyi_GPU_Win_Builder.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[build]\\scripts\\slave\\kill_processes.py"
     ],
     "name": "taskkill"
   },
   {
@@ skipping 460 matching lines @@
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-    ]
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-    "name": "trigger (2)",
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-      "@@@STEP_TEXT@Optional Win7 Release (NVIDIA)@@@"
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-      "@@@STEP_TEXT@Win7 Release (ATI)@@@"
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-    "name": "trigger (4)",
-    "trigger_specs": [
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-      "@@@STEP_TEXT@Win7 Release (NVIDIA GeForce 730)@@@"
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-  {
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-    "name": "trigger (6)",
-    "trigger_specs": [
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+      "@@@STEP_TEXT@Optional Win7 Release (ATI)<br />Optional Win7 Release (NVIDIA)<br />Win7 Release (ATI)<br />Win7 Release (NVIDIA GeForce 730)<br />Win7 Release (NVIDIA)<br />Win7 Release (New Intel)<br />Win8 Release (NVIDIA)@@@"
     ]
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]