Roll recipe dependencies (nontrivial).

scripts/slave/recipes/chromium_trybot.expected/full_tryserver_blink_win7_blink_dbg.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[build]\\scripts\\slave\\kill_processes.py"
     ],
     "name": "taskkill"
   },
   {
@@ skipping 243 matching lines @@
     ],
     "name": "read test spec (chromium.webkit.json)",
     "~followup_annotations": [
       "@@@STEP_TEXT@path: [BUILDER_CACHE]\\win_layout\\src\\testing\\buildbot\\chromium.webkit.json@@@",
       "@@@STEP_LOG_LINE@json.output@{}@@@",
       "@@@STEP_LOG_END@json.output@@@"
     ]
   },
   {
     "cmd": [
-      "RECIPE_PACKAGE_REPO[depot_tools]\\bootstrap\\win\\win_tools.bat"
+      "python",
+      "-u",
+      "RECIPE_PACKAGE_REPO[depot_tools]\\bootstrap\\win\\git_bootstrap.py",
+      "--verbose"
     ],
     "cwd": "RECIPE_PACKAGE_REPO[depot_tools]",
     "name": "ensure git tooling on windows",
     "timeout": 300
   },
   {
     "cmd": [
       "RECIPE_PACKAGE_REPO[depot_tools]\\git.bat",
       "diff",
       "--cached",
@@ skipping 219 matching lines @@
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "C:\\creds\\service_accounts\\service-account-goma-client.json"
     },
     "name": "process_dumps"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]