Allow gclient revert to remove symlinks

Previously links weren't caught at the appropriate point and instead passed to RemoveDirectory which then rejected them because they were links.

Patch contributed by Nasser <nasser@codeaurora>

Review URL: http://codereview.chromium.org/541012

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@35936 0039d316-1c4b-4281-b951-d872f2087c98

gclient_scm.py

@@ -485,7 +485,7 @@ class SVNWrapper(SCMWrapper, scm.SVN):
       try:
         if not os.path.exists(file_path):
           pass
-        elif os.path.isfile(file_path):
+        elif os.path.isfile(file_path) or os.path.islink(file_path):
           logging.info('os.remove(%s)' % file_path)
           os.remove(file_path)
         elif os.path.isdir(file_path):