Make apply_issue.py more aggressive when deleting an entry from a DEPS file.

Without this change, if an entry is removed from a DEPS file, it won't be
effectively deleted. Specify --delete_unversioned_trees so the dependency is
properly deleted.

TBR=szager@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/14531006

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@197081 0039d316-1c4b-4281-b951-d872f2087c98

apply_issue.py

@@ -175,7 +175,12 @@ def main():
       if sys.platform == 'win32':
         gclient_path += '.bat'
       return subprocess.call(
-          [gclient_path, 'sync', '--revision', base_rev, '--nohooks'],
+          [
+            gclient_path, 'sync',
+            '--revision', base_rev,
+            '--nohooks',
+            '--delete_unversioned_trees',
+          ],
           cwd=gclient_root)
   return 0