Roll recipe dependencies (nontrivial).

scripts/slave/recipes/skia/swarm_trigger.expected/recipe_with_gerrit_patch.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "config",
       "--spec",
       "cache_dir = None\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]\ntarget_os = ['llvm']"
     ],
@@ skipping 73 matching lines @@
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/apply_gerrit.py",
       "--gerrit_repo",
       "skia",
       "--gerrit_ref",
       "refs/changes/00/2100/2",
       "--root",
-      "[SLAVE_BUILD]/skia",
-      "--gerrit_rebase_patch_ref"
+      "[SLAVE_BUILD]/skia"
     ],
     "env": {
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "apply_gerrit"
   },
   {
     "cmd": [
       "python",
       "-u",
@@ skipping 543 matching lines @@
       "@@@STEP_LINK@shard #0 isolated out@blah@@@",
       "@@@STEP_LINK@view steps on Milo@https://luci-milo.appspot.com/swarming/task/148aa78d7aa0000@@@"
     ]
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]