Correct const accessors in base/values.(h|cc), Part II (ListValue)

chrome/browser/extensions/extension_function_test_utils.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 "chrome/browser/extensions/extension_function_test_utils.h"
 
 #include <string>
 
 #include "base/file_path.h"
 #include "base/json/json_reader.h"
@@ skipping 135 matching lines @@
     UIThreadExtensionFunction* function,
     const std::string& args,
     Browser* browser,
     RunFunctionFlags flags) {
   scoped_refptr<ExtensionFunction> function_owner(function);
   // Without a callback the function will not generate a result.
   function->set_has_callback(true);
   RunFunction(function, args, browser, flags);
   EXPECT_TRUE(function->GetError().empty()) << "Unexpected error: "
       << function->GetError();
-  base::Value* single_result = NULL;
+  const base::Value* single_result = NULL;
   if (function->GetResultList() != NULL &&
       function->GetResultList()->Get(0, &single_result)) {
     return single_result->DeepCopy();
   }
   return NULL;
 }
 
 // This helps us be able to wait until an AsyncExtensionFunction calls
 // SendResponse.
 class SendResponseDelegate
@@ skipping 58 matching lines @@
   if (!response_delegate.HasResponse()) {
     response_delegate.set_should_post_quit(true);
     content::RunMessageLoop();
   }
 
   EXPECT_TRUE(response_delegate.HasResponse());
   return response_delegate.GetResponse();
 }
 
 } // namespace extension_function_test_utils