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

scripts/slave/recipes/android/perf.expected/src_side_script_fails.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--master",
       "chromium.perf",
       "--builder",
       "Android Nexus5 Perf (1)",
@@ skipping 163 matching lines @@
       "@@@STEP_LOG_LINE@python.inline@      os.remove(os.path.join(base, f))@@@",
       "@@@STEP_LOG_END@python.inline@@@"
     ]
   },
   {
     "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",
       "gs://chrome-perf/android_perf_rel/full-build-linux_deadbeef.zip",
       "[SLAVE_BUILD]/src/out/build_product.zip"
     ],
     "name": "gsutil download_build_product"
   },
   {
@@ skipping 463 matching lines @@
       "[SLAVE_BUILD]/src/out/logcat"
     ],
     "name": "logcat_dump"
   },
   {
     "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",
       "-o",
       "GSUtil:parallel_composite_upload_threshold=50M",
       "----",
       "cp",
       "[SLAVE_BUILD]/src/out/Release/full_log",
       "gs://chromium-android/logcat_dumps/Android Nexus5 Perf (1)/571"
     ],
     "name": "gsutil upload",
@@ skipping 48 matching lines @@
       "@@@STEP_LOG_LINE@python.inline@  os.remove(report)@@@",
       "@@@STEP_LOG_END@python.inline@@@"
     ]
   },
   {
     "name": "$result",
     "reason": "src-side perf tests failed [StepFailure(\"1 tests failed: ['host_info']\",)]",
     "status_code": 1
   }
 ]