Reland: Stop passing raw pointers to base::Value API in c/b/chromeos and c/b/extensions

chrome/browser/extensions/api/proxy/proxy_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.
 
 // Implementation of helper functions for the Chrome Extensions Proxy Settings
 // API.
 //
 // Throughout this code, we report errors to the user by setting an |error|
 // parameter, if and only if these errors can be cause by invalid input
 // from the extension and we cannot expect that the extensions API has
@@ skipping 312 matching lines @@
     case ProxyPrefs::MODE_AUTO_DETECT:
       result_proxy_config = ProxyConfigDictionary::CreateAutoDetect();
       break;
     case ProxyPrefs::MODE_PAC_SCRIPT: {
       std::string url;
       if (!pac_url.empty()) {
         url = pac_url;
       } else if (!pac_data.empty()) {
         if (!CreateDataURLFromPACScript(pac_data, &url)) {
           *error = "Internal error, at base64 encoding of 'pacScript.data'.";
-          return NULL;
+          return nullptr;
         }
       } else {
         *error = "Proxy mode 'pac_script' requires a 'pacScript' field with "
                  "either a 'url' field or a 'data' field.";
-        return NULL;
+        return nullptr;
       }
       result_proxy_config =
           ProxyConfigDictionary::CreatePacScript(url, pac_mandatory);
       break;
     }
     case ProxyPrefs::MODE_FIXED_SERVERS: {
       if (proxy_rules_string.empty()) {
         *error = "Proxy mode 'fixed_servers' requires a 'rules' field.";
-        return NULL;
+        return nullptr;
       }
       result_proxy_config = ProxyConfigDictionary::CreateFixedServers(
           proxy_rules_string, bypass_list);
       break;
     }
     case ProxyPrefs::MODE_SYSTEM:
       result_proxy_config = ProxyConfigDictionary::CreateSystem();
       break;
     case ProxyPrefs::kModeCount:
       NOTREACHED();
@@ skipping 136 matching lines @@
                                 const std::string& delims) {
   base::ListValue* out = new base::ListValue;
   base::StringTokenizer entries(in, delims);
   while (entries.GetNext())
     out->AppendString(entries.token());
   return out;
 }
 
 }  // namespace proxy_api_helpers
 }  // namespace extensions