base: Stop passing a non-const ref to ObserverListBase::Iterator.

ppapi/proxy/ppapi_proxy_test.cc

 // Copyright (c) 2012 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.
 
 #include "ppapi/proxy/ppapi_proxy_test.h"
 
 #include <sstream>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 47 matching lines @@
 // We assume that only 1 harness's GetInterface function will ever support a
 // given interface name. In practice, there will either be only 1 GetInterface
 // handler (for PluginProxyTest or HostProxyTest), or there will be only 2
 // GetInterface handlers (for TwoWayTest).  In the latter case, one handler is
 // for the PluginProxyTestHarness and should only respond for PPP interfaces,
 // and the other handler is for the HostProxyTestHarness which should only
 // ever respond for PPB interfaces.
 ObserverList<ProxyTestHarnessBase> get_interface_handlers_;
 
 const void* MockGetInterface(const char* name) {
-  ObserverList<ProxyTestHarnessBase>::Iterator it =
-      get_interface_handlers_;
+  ObserverList<ProxyTestHarnessBase>::Iterator it(&get_interface_handlers_);
   while (ProxyTestHarnessBase* observer = it.GetNext()) {
     const void* interface = observer->GetInterface(name);
     if (interface)
       return interface;
   }
   if (strcmp(name, PPB_PROXY_PRIVATE_INTERFACE) == 0)
     return &ppb_proxy_private;
   return NULL;
 }
 
@@ skipping 495 matching lines @@
   plugin_thread_.message_loop_proxy()->PostTask(FROM_HERE,
       base::Bind(&RunTaskOnRemoteHarness,
                  task,
                  &task_complete));
   task_complete.Wait();
 }
 
 
 }  // namespace proxy
 }  // namespace ppapi