Remove --v arg from mojo_shell, it appears to no longer be valid.

sky/tools/skydb

 #!/usr/bin/env python
 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import argparse
 import logging
 import os
 from skypy.paths import Paths
 import socket;
@@ skipping 53 matching lines @@
         parser = argparse.ArgumentParser(description='Sky launcher/debugger')
         parser.add_argument('--gdb', action='store_true')
         parser.add_argument('--use-osmesa', action='store_true')
         parser.add_argument('url', nargs='?', type=str)
         args = parser.parse_args()
 
         content_handlers = ['%s,%s' % (mime_type, 'mojo:sky_viewer')
             for mime_type in SUPPORTED_MIME_TYPES]
         shell_command = [
             self.paths.mojo_shell_path,
-            '--v=1',
             '--content-handlers=%s' % ','.join(content_handlers),
             '--url-mappings=mojo:window_manager=mojo:sky_debugger',
             'mojo:window_manager',
         ]
         if args.url:
             url = args.url
             if not urlparse.urlparse(url).scheme:
                 url = self._start_http_server_for_file(url)
 
             prompt_args = '--args-for=mojo:sky_debugger_prompt %s' % url
@@ skipping 12 matching lines @@
 
 
 if __name__ == '__main__':
     skydb = SkyDebugger()
     try:
         skydb.main()
     except (KeyboardInterrupt, SystemExit):
         pass
     finally:
         skydb.shutdown()