Roll recipe dependencies (nontrivial).

scripts/slave/recipes/infra/build_repo_real_try.expected/ok-inner.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--master",
       "chromium.infra",
       "--builder",
       "build_repo_real",
       "--slave",
       "TestSlavename",
       "--spec",
       "cache_dir = '[GIT_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'build', 'url': 'https://chromium.googlesource.com/chromium/tools/build.git'}]",
       "--root",
       "build",
       "--revision_mapping_file",
       "{\"build\": \"got_revision\"}",
       "--git-cache-dir",
       "[GIT_CACHE]",
       "--output_json",
       "/path/to/tmp/json",
       "--revision",
       "build@HEAD",
       "--force",
       "--output_manifest"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "env": {
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "bot_update",
     "~followup_annotations": [
       "@@@STEP_TEXT@Some step text@@@",
       "@@@STEP_LOG_LINE@json.output@{@@@",
       "@@@STEP_LOG_LINE@json.output@  \"did_run\": true, @@@",
       "@@@STEP_LOG_LINE@json.output@  \"fixed_revisions\": {@@@",
       "@@@STEP_LOG_LINE@json.output@    \"build\": \"HEAD\"@@@",
@@ skipping 21 matching lines @@
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::git]/resources/git_setup.py",
       "--path",
       "[BUILD]/clone",
       "--url",
       "https://chromium.googlesource.com/chromium/tools/build"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "name": "git setup"
   },
   {
     "cmd": [
       "git",
       "retry",
       "fetch",
       "origin",
       "master"
     ],
@@ skipping 53 matching lines @@
     ],
     "cwd": "[BUILD]/clone",
     "name": "submodule update"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]