Remove the 'http_lock' and 'file_lock' code from webkitpy.

Tools/Scripts/webkitpy/common/system/systemhost.py

 # Copyright (c) 2011 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 12 matching lines @@
 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 import os
 import platform
 import sys
 
-from webkitpy.common.system import environment, executive, file_lock, filesystem, platforminfo, user, workspace
+from webkitpy.common.system import environment, executive, filesystem, platforminfo, user, workspace
 
 
 class SystemHost(object):
     def __init__(self):
         self.executive = executive.Executive()
         self.filesystem = filesystem.FileSystem()
         self.user = user.User()
         self.platform = platforminfo.PlatformInfo(sys, platform, self.executive)
         self.workspace = workspace.Workspace(self.filesystem, self.executive)
 
     def copy_current_environment(self):
         return environment.Environment(os.environ.copy())
-
-    def make_file_lock(self, path):
-        return file_lock.FileLock(path)