Use base namespace for string16 in components and cloud_print.

components/policy/core/common/registry_dict_win.cc

 // Copyright 2013 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 "components/policy/core/common/registry_dict_win.h"
 
 #include "base/json/json_reader.h"
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
@@ skipping 277 matching lines @@
        entry != other.values_.end(); ++entry) {
     SetValue(entry->first, make_scoped_ptr(entry->second->DeepCopy()));
   }
 }
 
 void RegistryDict::Swap(RegistryDict* other) {
   keys_.swap(other->keys_);
   values_.swap(other->values_);
 }
 
-void RegistryDict::ReadRegistry(HKEY hive, const string16& root) {
+void RegistryDict::ReadRegistry(HKEY hive, const base::string16& root) {
   ClearKeys();
   ClearValues();
 
   // First, read all the values of the key.
   for (RegistryValueIterator it(hive, root.c_str()); it.Valid(); ++it) {
     const std::string name = UTF16ToUTF8(it.Name());
     switch (it.Type()) {
       case REG_SZ:
       case REG_EXPAND_SZ:
         SetValue(
@@ skipping 82 matching lines @@
       return result.Pass();
     }
     default:
       LOG(WARNING) << "Can't convert registry key to schema type " << type;
   }
 
   return make_scoped_ptr(base::Value::CreateNullValue());
 }
 
 }  // namespace policy