Revert of Use remove_build_metadata.py on all the trybots.

scripts/slave/recipes/chromium_trybot.expected/swarming_basic_cq.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/bot_update.py",
       "--master",
       "tryserver.chromium.linux",
       "--builder",
       "linux_chromium_rel",
@@ skipping 218 matching lines @@
       "base_unittests",
       "base_unittests_run",
       "browser_tests",
       "browser_tests_run",
       "chrome"
     ],
     "name": "compile (with patch)"
   },
   {
     "cmd": [
-      "python",
-      "-u",
-      "[BUILD]/scripts/slave/recipe_modules/isolate/resources/remove_build_metadata.py",
-      "--build-dir",
-      "[SLAVE_BUILD]/src/out/Release",
-      "--src-dir",
-      "[SLAVE_BUILD]/src"
-    ],
-    "cwd": "[SLAVE_BUILD]",
-    "name": "remove_build_metadata.py"
-  },
-  {
-    "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/recipe_modules/isolate/resources/find_isolated_tests.py",
       "--build-dir",
       "[SLAVE_BUILD]/src/out/Release",
       "--output-json",
       "/path/to/tmp/json"
     ],
     "name": "find isolated tests",
     "~followup_annotations": [
@@ skipping 342 matching lines @@
       "https://chromium-swarm.appspot.com",
       "--decorate",
       "--print-status-updates",
       "--shards",
       "5",
       "browser_tests (with patch)/Ubuntu-12.04/[dummy has/linux_chromium_rel/571"
     ],
     "name": "browser_tests (with patch)"
   }
 ]