Roll recipe dependencies (nontrivial).

scripts/slave/recipes/webrtc/auto_roll_webrtc_deps.expected/rolling_activated.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/tools/pycurl.py",
       "https://webrtc-roll-cr-rev-status.appspot.com/status"
     ],
     "name": "check roll status",
     "stdout": "/path/to/tmp/",
     "~followup_annotations": [
       "@@@STEP_TEXT@Rolling activated@@@",
       "@@@STEP_LOG_LINE@stdout@1@@@",
       "@@@STEP_LOG_END@stdout@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
-      "--master",
-      "client.webrtc.fyi",
-      "--builder",
-      "Auto-roll - WebRTC DEPS",
-      "--slave",
-      "TestSlavename",
       "--spec",
       "cache_dir = '[GIT_CACHE]'\nsolutions = [{'deps_file': 'DEPS', 'managed': True, 'name': 'src', 'url': 'https://chromium.googlesource.com/external/webrtc'}, {'deps_file': 'DEPS', 'managed': True, 'name': 'webrtc-limited', 'url': 'https://chrome-internal.googlesource.com/chrome/deps/webrtc-limited'}]",
       "--root",
       "src",
       "--revision_mapping_file",
       "{\"src\": \"got_revision\"}",
       "--git-cache-dir",
       "[GIT_CACHE]",
       "--output_json",
       "/path/to/tmp/json",
@@ skipping 74 matching lines @@
     ],
     "cwd": "[SLAVE_BUILD]/src",
     "name": "autoroll chromium_revision"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]