Move //tools/gs.py into //mojo/public/tools

DEPS

 # This file is automatically processed to create .DEPS.git which is the file
 # that gclient uses under git.
 #
 # See http://code.google.com/p/chromium/wiki/UsingGit
 #
 # To test manually, run:
 #   python tools/deps2git/deps2git.py -o .DEPS.git -w <gclientdir>
 # where <gcliendir> is the absolute path to the directory containing the
 # .gclient file (the parent of 'src').
 #
@@ skipping 304 matching lines @@
                 '--no_auth',
                 '--bucket', 'chromium-eu-strip',
                 '-s', 'src/build/linux/bin/eu-strip.sha1',
     ],
   },
   # Pull the prebuilt network service binaries according to
   # mojo/public/tools/NETWORK_SERVICE_VERSION.
   {
     'name': 'download_network_service',
     'pattern': '',
-    'action': [ 'python', 'src/mojo/public/tools/download_network_service.py' ],
+    'action': [ 'python',
+                'src/mojo/public/tools/download_network_service.py',
+                '--tools-directory', '../../../tools',
+    ],
   },
   {
     # Ensure that we don't accidentally reference any .pyc files whose
     # corresponding .py files have already been deleted.
     'name': 'remove_stale_pyc_files',
     'pattern': 'src/tools/.*\\.py',
     'action': [
         'python',
         'src/tools/remove_stale_pyc_files.py',
         'src/tools',
     ],
   },
 ]