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

chrome/browser/extensions/extension_function_test_utils.cc

Index: chrome/browser/extensions/extension_function_test_utils.cc
diff --git a/chrome/browser/extensions/extension_function_test_utils.cc b/chrome/browser/extensions/extension_function_test_utils.cc
index 47c727db464b09d1e592932b72bdeacacb8869db..820fbdef1ad6352826554ba5408ce70f2feca731 100644
--- a/chrome/browser/extensions/extension_function_test_utils.cc
+++ b/chrome/browser/extensions/extension_function_test_utils.cc
@@ -153,7 +153,7 @@ base::Value* RunFunctionAndReturnSingleResult(
   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();