Revert 97943 - Switching NaCl 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": "93556",
   "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": "3da71eefa07c815a1aed9dc3a379fc41efda4b6b",
+  "nacl_irt_hash_x86_64": "147077c09e87ff2db20d32af2054bfb4de343c20",
   "nacl_revision": "6499",
   # 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": "97134", # 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
   # new values.
   "nacl_toolchain_mac_x86_newlib_hash":
-      "1b0855435c03c435a011c6105a509624b2a4edaa",
+      "be4cc2baf6eb34c8fe155a1bb61e2acd8ca1e924",
   "nacl_toolchain_win_x86_newlib_hash":
-      "5038a47b5a9a49acdc36cbe311aec7bce575c164",
+      "56667d7f653b1005cd5116de3d8e9faf346053cf",
   "nacl_toolchain_linux_x86_newlib_hash":
-      "01e245dc6dca16bea5cf840dbc77e3aa138f234f",
-  "nacl_toolchain_revision": "6494",
+      "5e4876a1fa53c7701cdbeef969a99b3ff0b0ddc5",
+  "nacl_toolchain_revision": "6429",
 
   "libjingle_revision": "77",
   "libvpx_revision": "97420",
   "ffmpeg_revision": "97428",
   "sfntly_revision": "54",
   "skia_revision": "2142",
   "v8_revision": "8982",
   "webrtc_revision": "242",
 
   # Note: On most bots, clang is not checked out via DEPS but by
@@ skipping 361 matching lines @@
   "sdch",
   "skia",
   "testing",
   "third_party",
   "v8",
 ]
 
 
 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"),
     ],
   },
-  {
-    # A change to a .gyp, .gypi, or to GYP itself should run the generator.
-    "pattern": ".",
-    "action": ["python", "src/build/gyp_chromium"],
-  },
 ]