vectors are cleared with "clear()", not with "empty()".

chrome/browser/process_singleton_uitest.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This test validates that the ProcessSingleton class properly makes sure
 // that there is only one main browser process.
 //
 // It is currently compiled and run on Windows and Posix(non-Mac) platforms.
 // Mac uses system services and ProcessSingletonMac is a noop.  (Maybe it still
 // makes sense to test that the system services are giving the behavior we
@@ skipping 297 matching lines @@
             base::kNullProcessHandle) {
           KillProcessTree(chrome_starters_[starter_index]->process_handle_);
         }
       }
       pending_starters.erase(pending_starters.begin() + done_index);
     }
 
     // "There can be only one!" :-)
     ASSERT_EQ(static_cast<size_t>(1), pending_starters.size());
     size_t last_index = pending_starters.front();
-    pending_starters.empty();
+    pending_starters.clear();
     if (chrome_starters_[last_index]->process_handle_ !=
         base::kNullProcessHandle) {
       KillProcessTree(chrome_starters_[last_index]->process_handle_);
       chrome_starters_[last_index]->done_event_.Wait();
     }
   }
 }
 
 }  // namespace