Fix regexp matching while looking for svn revision.

tools/sync-webkit-git.py

Index: tools/sync-webkit-git.py
diff --git a/tools/sync-webkit-git.py b/tools/sync-webkit-git.py
index 280923353e9a4bb976b784a17cc78125286d8315..41a4a15434971cf9f2dddf64c66e4e2634e589d5 100755
--- a/tools/sync-webkit-git.py
+++ b/tools/sync-webkit-git.py
@@ -35,7 +35,7 @@ def FindSVNRev(rev):
   """Map an SVN revision to a git hash.
   Like 'git svn find-rev' but without the git-svn bits."""
   # We find r123 by grepping for a line with "git-svn-id: blahblahblah@123".
-  return RunGit(['rev-list', '-n', '1', '--grep=^git-svn-id: .*@%s$' % rev,
+  return RunGit(['rev-list', '-n', '1', '--grep=^git-svn-id: .*trunk@%s ' % rev,
                  'origin'])
 
 def UpdateGClientBranch(webkit_rev):