Revert r4644, "Updated NaCl's build system to use SCons 2.0.1."

src/native_client/DEPS

 vars = {
   "chromium_trunk": "http://src.chromium.org/svn/trunk",
   "native_client_trunk": "http://src.chromium.org/native_client/trunk",
   "o3d_trunk": "http://o3d.googlecode.com/svn/trunk",
   "x86_toolchain_version": "4575",
   "arm_toolchain_version": "4590",
   "chrome_rev": "78322",
   "gyp_rev": "856",
   "gtest_rev": "364",
-  "tools_rev": "4632",
+  "tools_rev": "4214",
   "python_26_rev": "53573",
   "wix_rev": "153",
   "lcov_rev": "54822",
 }
 
 deps = {
   "chrome/test/pyautolib":
     Var("chromium_trunk") + "/src/chrome/test/pyautolib@" + Var("chrome_rev"),
   "tools/gyp":
     "http://gyp.googlecode.com/svn/trunk@" + Var("gyp_rev"),
   "build":
     Var("chromium_trunk") + "/src/build@" + Var("chrome_rev"),
   "testing/gtest":
     "http://googletest.googlecode.com/svn/trunk@" + Var("gtest_rev"),
   "third_party/gles2_book":
     Var("chromium_trunk") + "/src/third_party/gles2_book@" + Var("chrome_rev"),
   "third_party/gmp":
     Var("native_client_trunk") + "/src/third_party/gmp@" + Var("tools_rev"),
   "third_party/qemu":
     Var("native_client_trunk") + "/src/third_party/qemu@" + Var("tools_rev"),
   "third_party/mpfr":
     Var("native_client_trunk") + "/src/third_party/mpfr@" + Var("tools_rev"),
   "third_party/pylib":
     Var("native_client_trunk") + "/src/third_party/pylib@" + Var("tools_rev"),
-  "third_party/scons-2.0.1":
-    (Var("native_client_trunk") + "/src/third_party/scons-2.0.1@" +
-     Var("tools_rev")),
+  "third_party/scons":
+    Var("native_client_trunk") + "/src/third_party/scons@" + Var("tools_rev"),
   "third_party/selenium":
     (Var("native_client_trunk") + "/src/third_party/selenium@" +
      Var("tools_rev")),
   "third_party/zlib":
     Var("native_client_trunk") + "/src/third_party/zlib@" + Var("tools_rev"),
   "third_party/npapi/bindings":  # Includes needed for using Chromium NPAPI
     (Var("chromium_trunk") + "/src/third_party/npapi/bindings@" +
      Var("chrome_rev")),
   "base":
     Var("chromium_trunk") + "/src/base@" + Var("chrome_rev"),
@@ skipping 40 matching lines @@
                "native_client/build/all.gyp"],
   },
   {
     "pattern": "DEPS$",
     "action": ["python", "native_client/build/download_toolchains.py",
                "--x86-version", Var("x86_toolchain_version"),
                "--arm-version", Var("arm_toolchain_version")],
   },
 ]