Roll recipe dependencies (nontrivial).

scripts/slave/recipes/art.expected/mips64-emulator-debug__ON__client.art__clobber.json

 [
   {
     "cmd": [
       "[DEPOT_TOOLS]/repo",
       "init",
       "-u",
       "https://android.googlesource.com/platform/manifest",
       "-b",
       "master-art"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "name": "repo init"
   },
   {
     "cmd": [
       "[DEPOT_TOOLS]/repo",
       "sync"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "name": "repo sync"
   },
   {
     "cmd": [
       "python",
       "-u",
       "\nimport os, sys\nfrom common import chromium_utils # Error? See https://crbug.com/584783.\n\n\nif os.path.exists(sys.argv[1]):\n  chromium_utils.RemoveDirectory(sys.argv[1])\n",
       "[SLAVE_BUILD]/out"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "name": "rmtree clobber",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@python.inline@@@@",
       "@@@STEP_LOG_LINE@python.inline@import os, sys@@@",
       "@@@STEP_LOG_LINE@python.inline@from common import chromium_utils # Error? See https://crbug.com/584783.@@@",
       "@@@STEP_LOG_LINE@python.inline@@@@",
       "@@@STEP_LOG_LINE@python.inline@@@@",
       "@@@STEP_LOG_LINE@python.inline@if os.path.exists(sys.argv[1]):@@@",
       "@@@STEP_LOG_LINE@python.inline@  chromium_utils.RemoveDirectory(sys.argv[1])@@@",
       "@@@STEP_LOG_END@python.inline@@@"
     ]
   },
   {
     "cmd": [
       "[SLAVE_BUILD]/art/tools/buildbot-build.sh",
       "-j8",
       "--target"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "env": {
       "ANDROID_BUILD_TOP": "[SLAVE_BUILD]",
       "ANDROID_PRODUCT_OUT": "[SLAVE_BUILD]/out/target/product/mips64r6",
       "ANDROID_SERIAL": "emulator-5554",
       "ART_BUILD_HOST_DEBUG": "false",
       "ART_TEST_ANDROID_ROOT": "/data/local/tmp/system",
       "ART_TEST_FULL": "false",
       "ART_TEST_INTERPRETER": "true",
       "ART_TEST_JIT": "true",
       "ART_TEST_KEEP_GOING": "true",
@@ skipping 11 matching lines @@
       "USE_DEX2OAT_DEBUG": "false"
     },
     "name": "build target"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]