gsutil: use depot_tools.gsutil_py_path instead of path['depot_tools']

scripts/slave/recipe_modules/chromium_android/example.expected/coverage_builder_basic.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "\nimport os, sys\n\nbuild_path = sys.argv[1]\nif os.path.exists(build_path):\n  for (path, dir, files) in os.walk(build_path):\n    for cur_file in files:\n      if cur_file.endswith('index.lock'):\n        path_to_file = os.path.join(path, cur_file)\n        print 'deleting %s' % path_to_file\n        os.remove(path_to_file)\n",
       "[SLAVE_BUILD]"
     ],
     "name": "cleanup index.lock",
     "~followup_annotations": [
@@ skipping 699 matching lines @@
     ],
     "name": "Zip generated coverage report files",
     "stdin": "{\"entries\": [{\"path\": \"[SLAVE_BUILD]/src/out/Release/coverage/coverage_html\", \"type\": \"dir\"}], \"output\": \"[SLAVE_BUILD]/src/out/Release/coverage/coverage_html.zip\", \"root\": \"[SLAVE_BUILD]/src/out/Release/coverage/coverage_html\"}"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[build::gsutil]/resources/gsutil_wrapper.py",
       "--",
-      "[DEPOT_TOOLS]/gsutil.py",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gsutil.py",
       "--force-version",
       "4.7",
       "----",
       "cp",
       "[SLAVE_BUILD]/src/out/Release/coverage/coverage_html.zip",
       "gs://chrome-code-coverage/java/coverage_builder/4f4b02f6b7fa20a3a25682c457bbc8ad589c8a00/"
     ],
     "name": "gsutil upload coverage report",
     "~followup_annotations": [
       "@@@STEP_LINK@Coverage report@https://storage.cloud.google.com/chrome-code-coverage/java/coverage_builder/4f4b02f6b7fa20a3a25682c457bbc8ad589c8a00/@@@"
     ]
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]