Fix a specific failure when reverting embedded directories.

TEST=gclient revert doesn't throw an exception
BUG=none

Review URL: http://codereview.chromium.org/255083

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@28059 0039d316-1c4b-4281-b951-d872f2087c98

gclient_scm.py

@@ -370,9 +370,15 @@ class SVNWrapper(SCMWrapper):
       except EnvironmentError:
         logging.error('Failed to remove %s.' % file_path)
 
-    # svn revert is so broken we don't even use it. Using
-    # "svn up --revision BASE" achieve the same effect.
-    RunSVNAndGetFileList(['update', '--revision', 'BASE'], path, file_list)
+    try:
+      # svn revert is so broken we don't even use it. Using
+      # "svn up --revision BASE" achieve the same effect.
+      RunSVNAndGetFileList(['update', '--revision', 'BASE'], path,
+                           file_list)
+    except OSError, e:
+      # Maybe the directory disapeared meanwhile. We don't want it to throw an
+      # exception.
+      logging.error('Failed to update:\n%s' % str(e))
 
   def runhooks(self, options, args, file_list):
     self.status(options, args, file_list)