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

chrome/browser/extensions/api/web_request/web_request_api_helpers.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/api/web_request/web_request_api_helpers.h"
 
 #include "base/bind.h"
 #include "base/string_util.h"
 #include "base/stringprintf.h"
 #include "base/values.h"
@@ skipping 99 matching lines @@
 ListValue* StringToCharList(const std::string& s) {
   ListValue* result = new ListValue;
   for (size_t i = 0, n = s.size(); i < n; ++i) {
     result->Append(
         Value::CreateIntegerValue(
             *reinterpret_cast<const unsigned char*>(&s[i])));
   }
   return result;
 }
 
-bool CharListToString(ListValue* list, std::string* out) {
+bool CharListToString(const ListValue* list, std::string* out) {
   if (!list)
     return false;
   const size_t list_length = list->GetSize();
   out->resize(list_length);
   int value = 0;
   for (size_t i = 0; i < list_length; ++i) {
     if (!list->GetInteger(i, &value) || value < 0 || value > 255)
       return false;
     unsigned char tmp = static_cast<unsigned char>(value);
     (*out)[i] = *reinterpret_cast<char*>(&tmp);
@@ skipping 494 matching lines @@
 
 bool CanExtensionAccessURL(const extensions::Extension* extension,
                            const GURL& url) {
   // about: URLs are not covered in host permissions, but are allowed anyway.
   return (url.SchemeIs(chrome::kAboutScheme) ||
           extension->HasHostPermission(url) ||
           url.GetOrigin() == extension->url());
 }
 
 }  // namespace extension_web_request_api_helpers