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

chrome/renderer/extensions/chrome_v8_context_set.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/renderer/extensions/chrome_v8_context_set.h"
 
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/tracked_objects.h"
 #include "base/values.h"
@@ skipping 119 matching lines @@
 
     if (render_view && render_view != context_render_view)
       continue;
 
     if (!HasSufficientPermissions(context_render_view, event_url))
       continue;
 
     v8::Local<v8::Context> context(*((*it)->v8_context()));
     std::vector<v8::Handle<v8::Value> > v8_arguments;
     for (size_t i = 0; i < arguments.GetSize(); ++i) {
-      base::Value* item = NULL;
+      const base::Value* item = NULL;
       CHECK(arguments.Get(i, &item));
       v8_arguments.push_back(converter->ToV8Value(item, context));
     }
 
     v8::Handle<v8::Value> retval;
     (*it)->CallChromeHiddenMethod(
         method_name, v8_arguments.size(), &v8_arguments[0], &retval);
   }
 }