Fix http server to not gzip files when etag matches.

mojo/devtools/common/devtoolslib/http_server.py

 # Copyright 2015 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 atexit
 import datetime
 import email.utils
 import errno
 import hashlib
 import logging
@@ skipping 101 matching lines @@
       self.etag = '"%s"' % sha256.hexdigest()
       return self.etag
 
     def send_head(self):
       # Always close the connection after each request, as the keep alive
       # support from SimpleHTTPServer doesn't like when the client requests to
       # close the connection before downloading the full response content.
       # pylint: disable=W0201
       self.close_connection = 1
 
-      path = self.translate_path(self.path)
+      path = self.translate_path(self.path, False)
       if os.path.isfile(path):
         # Handle If-None-Match
         etag = self.get_etag()
         if ('If-None-Match' in self.headers and
             etag == self.headers['If-None-Match']):
           self.send_response(304)
           return None
 
         # Handle If-Modified-Since
         if ('If-None-Match' not in self.headers and
@@ skipping 102 matching lines @@
   except socket.error as v:
     error_code = v[0]
     print 'Failed to start http server for %s on port %d: %s.' % (
         str(mappings), host_port, os.strerror(error_code))
     if error_code == errno.EADDRINUSE:
       print ('  Run `fuser %d/tcp` to find out which process is using the port;'
              % host_port)
       print ('  or `fuser -k %d/tcp` terminate it.' % host_port)
     print '---'
     raise