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

scripts/slave/recipes/flutter/engine.expected/linux.json

Index: scripts/slave/recipes/flutter/engine.expected/linux.json
diff --git a/scripts/slave/recipes/flutter/engine.expected/linux.json b/scripts/slave/recipes/flutter/engine.expected/linux.json
index 23b5aa14d51ceb218af9fb55daaef95b4268f608..53658341a70ba63d69c18e797126db7df65b1030 100644
--- a/scripts/slave/recipes/flutter/engine.expected/linux.json
+++ b/scripts/slave/recipes/flutter/engine.expected/linux.json
@@ -172,7 +172,7 @@
       "-u",
       "RECIPE_MODULE[build::gsutil]/resources/gsutil_wrapper.py",
       "--",
-      "[DEPOT_TOOLS]/gsutil.py",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gsutil.py",
       "----",
       "cp",
       "[TMP_BASE]/tmp_tmp_1/artifacts.zip",
@@ -263,7 +263,7 @@
       "-u",
       "RECIPE_MODULE[build::gsutil]/resources/gsutil_wrapper.py",
       "--",
-      "[DEPOT_TOOLS]/gsutil.py",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gsutil.py",
       "----",
       "cp",
       "[TMP_BASE]/tmp_tmp_2/artifacts.zip",
@@ -339,7 +339,7 @@
       "-u",
       "RECIPE_MODULE[build::gsutil]/resources/gsutil_wrapper.py",
       "--",
-      "[DEPOT_TOOLS]/gsutil.py",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gsutil.py",
       "----",
       "cp",
       "[TMP_BASE]/tmp_tmp_3/artifacts.zip",
@@ -393,7 +393,7 @@
       "-u",
       "RECIPE_MODULE[build::gsutil]/resources/gsutil_wrapper.py",
       "--",
-      "[DEPOT_TOOLS]/gsutil.py",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gsutil.py",
       "----",
       "cp",
       "[TMP_BASE]/tmp_tmp_4/artifacts.zip",
@@ -469,7 +469,7 @@
       "-u",
       "RECIPE_MODULE[build::gsutil]/resources/gsutil_wrapper.py",
       "--",
-      "[DEPOT_TOOLS]/gsutil.py",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gsutil.py",
       "----",
       "cp",
       "[TMP_BASE]/tmp_tmp_5/artifacts.zip",
@@ -523,7 +523,7 @@
       "-u",
       "RECIPE_MODULE[build::gsutil]/resources/gsutil_wrapper.py",
       "--",
-      "[DEPOT_TOOLS]/gsutil.py",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gsutil.py",
       "----",
       "cp",
       "[TMP_BASE]/tmp_tmp_6/artifacts.zip",
@@ -577,7 +577,7 @@
       "-u",
       "RECIPE_MODULE[build::gsutil]/resources/gsutil_wrapper.py",
       "--",
-      "[DEPOT_TOOLS]/gsutil.py",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gsutil.py",
       "----",
       "cp",
       "[TMP_BASE]/tmp_tmp_7/sky_engine.zip",
@@ -631,7 +631,7 @@
       "-u",
       "RECIPE_MODULE[build::gsutil]/resources/gsutil_wrapper.py",
       "--",
-      "[DEPOT_TOOLS]/gsutil.py",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gsutil.py",
       "----",
       "cp",
       "[TMP_BASE]/tmp_tmp_8/sky_services.zip",
@@ -673,7 +673,7 @@
       "-u",
       "RECIPE_MODULE[build::gsutil]/resources/gsutil_wrapper.py",
       "--",
-      "[DEPOT_TOOLS]/gsutil.py",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gsutil.py",
       "----",
       "cp",
       "[SLAVE_BUILD]/src/out/android_debug/gen/third_party/gcm/gcm_lib.dex.jar",
@@ -693,7 +693,7 @@
       "-u",
       "RECIPE_MODULE[build::gsutil]/resources/gsutil_wrapper.py",
       "--",
-      "[DEPOT_TOOLS]/gsutil.py",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gsutil.py",
       "----",
       "cp",
       "[SLAVE_BUILD]/src/out/android_debug/gen/third_party/gcm/interfaces_java.dex.jar",
@@ -747,7 +747,7 @@
       "-u",
       "RECIPE_MODULE[build::gsutil]/resources/gsutil_wrapper.py",
       "--",
-      "[DEPOT_TOOLS]/gsutil.py",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gsutil.py",
       "----",
       "cp",
       "[TMP_BASE]/tmp_tmp_9/artifacts.zip",
@@ -823,7 +823,7 @@
       "-u",
       "RECIPE_MODULE[build::gsutil]/resources/gsutil_wrapper.py",
       "--",
-      "[DEPOT_TOOLS]/gsutil.py",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gsutil.py",
       "----",
       "cp",
       "[TMP_BASE]/tmp_tmp_10/artifacts.zip",