Remove ignored bot_update "force" parameter.

scripts/slave/recipes/chromium.expected/full_chromium_webrtc_fyi_Linux_Tester.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",
       "[BUILDER_CACHE]/Linux_Tester",
       "511"
     ],
     "name": "makedirs checkout path",
@@ skipping 30 matching lines @@
       "--git-cache-dir",
       "[GIT_CACHE]",
       "--output_json",
       "/path/to/tmp/json",
       "--revision",
       "src@HEAD",
       "--revision",
       "src/third_party/libjingle/source/talk@HEAD",
       "--revision",
       "src/third_party/webrtc@HEAD",
-      "--force",
       "--output_manifest"
     ],
     "cwd": "[BUILDER_CACHE]/Linux_Tester",
     "env": {
       "GCLIENT_KILL_GIT_FETCH_AFTER": "1200",
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "bot_update",
     "~followup_annotations": [
       "@@@STEP_TEXT@Some step text@@@",
@@ skipping 415 matching lines @@
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
     },
     "name": "remoting_unittests"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]