Move Singleton and related structs to namespace base

ppapi/proxy/interface_list.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/interface_list.h"
 
 #include "base/hash.h"
 #include "base/lazy_instance.h"
 #include "base/memory/singleton.h"
 #include "ppapi/c/dev/ppb_audio_input_dev.h"
@@ skipping 300 matching lines @@
 #endif
 }
 
 InterfaceList::~InterfaceList() {
 }
 
 // static
 InterfaceList* InterfaceList::GetInstance() {
   // CAUTION: This function is called without the ProxyLock to avoid excessive
   // excessive locking from C++ wrappers. (See also GetBrowserInterface.)
-  return Singleton<InterfaceList>::get();
+  return base::Singleton<InterfaceList>::get();
 }
 
 // static
 void InterfaceList::SetProcessGlobalPermissions(
     const PpapiPermissions& permissions) {
   g_process_global_permissions.Get() = permissions;
 }
 
 InterfaceProxy::Factory InterfaceList::GetFactoryForID(ApiID id) const {
   int index = static_cast<int>(id);
@@ skipping 76 matching lines @@
 
 int InterfaceList::HashInterfaceName(const std::string& name) {
   uint32 data = base::Hash(name.c_str(), name.size());
   // Strip off the signed bit because UMA doesn't support negative values,
   // but takes a signed int as input.
   return static_cast<int>(data & 0x7fffffff);
 }
 
 }  // namespace proxy
 }  // namespace ppapi