Switching IRT to be built inside the chrome build.

DEPS

 vars = {
   # Use this googlecode_url variable only if there is an internal mirror for it.
   # If you do not know, use the full path while defining your new deps entry.
   "googlecode_url": "http://%s.googlecode.com/svn",
   "webkit_trunk": "http://svn.webkit.org/repository/webkit/trunk",
   "nacl_trunk": "http://src.chromium.org/native_client/trunk",
   "webkit_revision": "93234",
   "chromium_git": "http://git.chromium.org/git",
   "swig_revision": "69281",
-  # These hashes need to be updated when nacl_revision is changed.
-  # After changing nacl_revision, run 'gclient runhooks' to get the new values.
-  "nacl_irt_hash_x86_32": "96f8b8602ee43b05898fb22302fb5eb2dded4d5c",
-  "nacl_irt_hash_x86_64": "9b04a640e6216aea7153654dee1ab264fb537478",
   "nacl_revision": "6459",
   # After changing nacl_revision, run 'glient sync' and check native_client/DEPS
   # to update other nacl_*_revision's.
   # TODO(brettw) We should use the "From" syntax to avoid hardcoding the
   # revisions here, but it makes checkdeps confused. We should fix checkdeps.
   "nacl_chrome_ppapi_revision": "96903", # native_client/DEPS: chrome_ppapi_rev 
   "nacl_tools_revision": "5360",  # native_client/DEPS: tools_rev
 
   # These hashes need to be updated when nacl_toolchain_revision is changed.
   # After changing nacl_toolchain_revision, run 'gclient runhooks' to get the
@@ skipping 387 matching lines @@
 ]
 
 
 hooks = [
   {
     # A change to a .gyp, .gypi, or to GYP itself should run the generator.
     "pattern": ".",
     "action": ["python", "src/build/gyp_chromium"],
   },
   {
-    # This downloads binaries for Native Client's integrated runtime (IRT)
-    # library, which is built as NaCl untrusted code.
-    "pattern": ".",
-    "action": ["python", "src/build/download_nacl_irt.py",
-               "--nacl_revision", Var("nacl_revision"),
-               "--file_hash", "x86_32", Var("nacl_irt_hash_x86_32"),
-               "--file_hash", "x86_64", Var("nacl_irt_hash_x86_64")],
-  },
-  {
     # This downloads binaries for Native Client's newlib toolchain.
     # Done in lieu of building the toolchain from scratch as it can take
     # anywhere from 30 minutes to 4 hours depending on platform to build.
     "pattern": ".",
     "action": [
         "python", "src/build/download_nacl_toolchains.py",
          "--x86-version", Var("nacl_toolchain_revision"),
          "--nacl-newlib-only",
          "--file-hash", "mac_x86_newlib",
              Var("nacl_toolchain_mac_x86_newlib_hash"),
          "--file-hash", "win_x86_newlib",
              Var("nacl_toolchain_win_x86_newlib_hash"),
          "--file-hash", "linux_x86_newlib",
              Var("nacl_toolchain_linux_x86_newlib_hash"),
     ],
   },
 ]