Correct const accessors in base/values.(h|cc)

chrome/test/webdriver/commands/command.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.
 
 #include "chrome/test/webdriver/commands/command.h"
 
 namespace webdriver {
 
 Command::Command(const std::vector<std::string>& path_segments,
-                 const DictionaryValue* const parameters)
+                 DictionaryValue* const parameters)
     : path_segments_(path_segments),
       parameters_(parameters) {}
 
 Command::~Command() {}
 
 bool Command::DoesDelete() {
   return false;
 }
 
 bool Command::DoesGet() {
@@ skipping 12 matching lines @@
 
 std::string Command::GetPathVariable(const size_t i) const {
   return i < path_segments_.size() ? path_segments_.at(i) : "";
 }
 
 bool Command::HasParameter(const std::string& key) const {
   return parameters_.get() && parameters_->HasKey(key);
 }
 
 bool Command::IsNullParameter(const std::string& key) const {
-  Value* value;
+  const Value* value;
   return parameters_.get() &&
          parameters_->Get(key, &value) &&
          value->IsType(Value::TYPE_NULL);
 }
 
 bool Command::GetStringParameter(const std::string& key,
                                  string16* out) const {
   return parameters_.get() != NULL && parameters_->GetString(key, out);
 }
 
@@ skipping 20 matching lines @@
 bool Command::GetDoubleParameter(const std::string& key, double* out) const {
   return parameters_.get() != NULL && parameters_->GetDouble(key, out);
 }
 
 bool Command::GetDictionaryParameter(const std::string& key,
                                      DictionaryValue** out) const {
   return parameters_.get() != NULL && parameters_->GetDictionary(key, out);
 }
 
 bool Command::GetListParameter(const std::string& key,
-                               ListValue** out) const {
+                               const ListValue** out) const {
   return parameters_.get() != NULL && parameters_->GetList(key, out);
 }
 
 }  // namespace webdriver