git-try: When -r isn't specified, let the try server decide the revision.

git-try

 #!/usr/bin/python
 
 import getpass
 import optparse
 import os
 import subprocess
 import tempfile
 import traceback
 import urllib
 import sys
@@ skipping 31 matching lines @@
   branch = branch[len('refs/heads/'):]
   return branch
 
 
 def GetPatchName():
   """Construct a name for this patch."""
   short_sha = Backquote(['git', 'rev-parse', '--short=4', 'HEAD'])
   return GetBranchName() + '-' + short_sha
 
 
-def GetRevision():
-  """Get the latest Subversion revision number."""
-  for line in Backquote(['git', 'svn', 'info']).split('\n'):
-    if line.startswith('Revision:'):
-      return line[len('Revision:'):].strip()
-  raise "Couldn't figure out latest revision"
-
-
 def GetRietveldIssueNumber():
   return Backquote(['git', 'config',
                     'branch.%s.rietveldissue' % GetBranchName()])
 
 
 def GetRietveldPatchsetNumber():
   return Backquote(['git', 'config',
                     'branch.%s.rietveldpatchset' % GetBranchName()])
 
 
@@ skipping 96 matching lines @@
         '--use_svn', '--svn_repo',
         'svn://svn.chromium.org/chrome-try/try',
     ])
 
   if options.bot:
     args.extend(['--bot', options.bot])
   if options.clobber:
     args.append('--clobber')
   if options.revision:
     args.extend(['-r', options.revision])
-  else:
-    args.extend(['-r', GetRevision()])
   if GetRietveldPatchsetNumber():
     args.extend([
         '--issue', GetRietveldIssueNumber(),
         '--patchset', GetRietveldPatchsetNumber(),
     ])
 
   print sendmsg
   TryChange(args=args)