Fixing missed reference to old nacl sdk DEPS.

BUG=None
TEST=None
R=noelallen@google.com

TBR
Review URL: http://codereview.chromium.org/8772048

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@112724 0039d316-1c4b-4281-b951-d872f2087c98

native_client_sdk/src/build_tools/build.scons

@@ -279,7 +279,7 @@ for dir in env['NACL_TOOLCHAIN_ROOTS'].values():
 
 nacl_tools_cmd = env.Command(all_tools,
                              ['make_nacl_tools.py',
-                              os.path.join(env['ROOT_DIR'], 'DEPS')],
+                              os.path.join(env['SRC_DIR'], 'DEPS')],
                              build_nacl_tools)
 env.Depends(nacl_tools_cmd, env.GetHeadersNode())
 env.Depends(env.GetToolchainNode(), nacl_tools_cmd)