Switch to cipd module in depot_tools

scripts/slave/recipes/webrtc/ios.expected/gn_build.json

 [
   {
     "cmd": [
       "RECIPE_PACKAGE_REPO[build]/scripts/slave/ios/host_info.py",
       "--json-file",
       "/path/to/tmp/json"
     ],
     "name": "host and tools info",
     "~followup_annotations": [
       "@@@STEP_TEXT@<br />OS X 1.2.3, Xcode 6.7.8 (5D342509a)@@@",
@@ skipping 159 matching lines @@
     ]
   },
   {
     "cmd": [],
     "name": "ensure_goma"
   },
   {
     "cmd": [
       "python",
       "-u",
-      "RECIPE_MODULE[build::cipd]/resources/bootstrap.py",
+      "RECIPE_MODULE[depot_tools::cipd]/resources/bootstrap.py",
       "--platform",
       "mac-amd64",
       "--dest-directory",
       "[SLAVE_BUILD]/cipd",
       "--json-output",
       "/path/to/tmp/json"
     ],
     "name": "ensure_goma.install cipd",
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@1@@@",
@@ skipping 63 matching lines @@
     ],
     "cwd": "[BUILDER_CACHE]/ios/src/out/Debug-iphoneos",
     "name": "compile"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]