Add swarming support for MB (and the GN bots) in the chromium recipes.

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

Index: scripts/slave/recipes/chromium.expected/buildnumber_zero.json
diff --git a/scripts/slave/recipes/chromium.expected/buildnumber_zero.json b/scripts/slave/recipes/chromium.expected/buildnumber_zero.json
index 197d0483972702c2881847e908ca47a821a599bb..950950b6e19aa15e6839ffa5959af741bca2beaf 100644
--- a/scripts/slave/recipes/chromium.expected/buildnumber_zero.json
+++ b/scripts/slave/recipes/chromium.expected/buildnumber_zero.json
@@ -141,15 +141,6 @@
     "cmd": [
       "python",
       "-u",
-      "[BUILD]/scripts/slave/cleanup_temp.py"
-    ],
-    "cwd": "[SLAVE_BUILD]",
-    "name": "cleanup_temp"
-  },
-  {
-    "cmd": [
-      "python",
-      "-u",
       "\nimport os, sys\nfrom common import chromium_utils\n\nif os.path.exists(sys.argv[1]):\n  chromium_utils.RemoveDirectory(sys.argv[1])\n",
       "[SLAVE_BUILD]/src/out/Release"
     ],
@@ -185,6 +176,15 @@
     "name": "extract build"
   },
   {
+    "cmd": [
+      "python",
+      "-u",
+      "[BUILD]/scripts/slave/cleanup_temp.py"

[M-A Ruel, 2015/06/10 14:55:31]

It's a bit late, unintentional?

[Dirk Pranke, 2015/06/10 16:11:39]

I'm not sure why this changed. Will investigate.

+    ],
+    "cwd": "[SLAVE_BUILD]",
+    "name": "cleanup_temp"
+  },
+  {
     "allow_subannotations": true,
     "cmd": [
       "python",