Roll recipe dependencies (nontrivial).

recipes/recipes/depot_tools_builder.expected/basic.json

 [
   {
     "cmd": [],
     "name": "clean workspace"
   },
   {
     "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",
@@ skipping 215 matching lines @@
       "@@@STEP_LOG_LINE@json.output@  \"executable\": \"[SLAVE_BUILD]/cipd/cipd\", @@@",
       "@@@STEP_LOG_LINE@json.output@  \"instance_id\": \"40-chars-fake-of-the-package-instance_id\"@@@",
       "@@@STEP_LOG_LINE@json.output@}@@@",
       "@@@STEP_LOG_END@json.output@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
-      "\nimport shutil\nimport sys\nshutil.copy(sys.argv[1], sys.argv[2])\n",
+      "\nimport shutil\nimport sys\n# Apparently, shutil.copy fails if files are binary-equal on *nix OSes.\n# See http://crbug.com/636168#c8.\nif hasattr(shutil, '_samefile'):\n  if shutil._samefile(sys.argv[1], sys.argv[2]):\n    sys.exit(0)\nshutil.copy(sys.argv[1], sys.argv[2])\n",
       "[SLAVE_BUILD]/depot_tools/bootstrap/win/git_version.txt",
       "/path/to/tmp/"
     ],
     "name": "read git version",
     "~followup_annotations": [
       "@@@STEP_TEXT@got '1.2.3'@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
-      "\nimport shutil\nimport sys\nshutil.copy(sys.argv[1], sys.argv[2])\n",
+      "\nimport shutil\nimport sys\n# Apparently, shutil.copy fails if files are binary-equal on *nix OSes.\n# See http://crbug.com/636168#c8.\nif hasattr(shutil, '_samefile'):\n  if shutil._samefile(sys.argv[1], sys.argv[2]):\n    sys.exit(0)\nshutil.copy(sys.argv[1], sys.argv[2])\n",
       "[SLAVE_BUILD]/depot_tools/bootstrap/win/git_version_bleeding_edge.txt",
       "/path/to/tmp/"
     ],
     "name": "read git version (bleeding_edge)",
     "~followup_annotations": [
       "@@@STEP_TEXT@got '2.2.3'@@@"
     ]
   },
   {
     "cmd": [
@@ skipping 136 matching lines @@
       "[TMP_BASE]/git_installer_tmp_2"
     ],
     "name": "rmtree [TMP_BASE]/git_installer_tmp_2"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]