Remove GYP build from bots and 'gclient runhooks'

DEPS

 # DEPS files look like -*- Python -*-
 
 vars = {
   # These revisions are slices of the chromium repository.
   # Because they come from separate sub-slices, their hashes do not match at
   # equivalent revisions. When updating them, use the roll-dep script
   # to move them to equivalent revisions. Additionally, because not all
   # directories contain commits at each revision, you will need to select
   # revisions at latest revision up to a high watermark from each slice.
   # Document the high watermark here:
@@ skipping 239 matching lines @@
     ],
   },
   # Cleanup any stale package_version files.
   {
     "pattern": ".",
     "action": ["python",
                "native_client/build/package_version/package_version.py",
                "cleanup",
     ],
   },
-
-  # Run GYP, do this last to make sure all the tools are present first.
-  {
-    "pattern": ".",
-    "action": ["python", "native_client/build/gyp_nacl"],
-  },
 ]
 
 include_rules = [
   "+native_client/src/include",
   "+gtest",
 ]