Use Persistent::Reset.

net/proxy/proxy_resolver_v8.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 "net/proxy/proxy_resolver_v8.h"
 
 #include <algorithm>
 #include <cstdio>
 
 #include "base/basictypes.h"
@@ skipping 386 matching lines @@
     }
 
     results->UsePacString(UTF16ToASCII(ret_str));
     return OK;
   }
 
   int InitV8(const scoped_refptr<ProxyResolverScriptData>& pac_script) {
     v8::Locker locked(isolate_);
     v8::HandleScope scope;
 
-    v8_this_ = v8::Persistent<v8::External>::New(isolate_,
-                                                 v8::External::New(this));
+    v8_this_.Reset(isolate_, v8::External::New(this));
     v8::Local<v8::ObjectTemplate> global_template = v8::ObjectTemplate::New();
 
     // Attach the javascript bindings.
     v8::Local<v8::FunctionTemplate> alert_template =
         v8::FunctionTemplate::New(&AlertCallback, v8_this_);
     global_template->Set(ASCIILiteralToV8String("alert"), alert_template);
 
     v8::Local<v8::FunctionTemplate> my_ip_address_template =
         v8::FunctionTemplate::New(&MyIpAddressCallback, v8_this_);
     global_template->Set(ASCIILiteralToV8String("myIpAddress"),
@@ skipping 19 matching lines @@
     v8::Local<v8::FunctionTemplate> sort_ip_address_list_template =
         v8::FunctionTemplate::New(&SortIpAddressListCallback, v8_this_);
     global_template->Set(ASCIILiteralToV8String("sortIpAddressList"),
                          sort_ip_address_list_template);
 
     v8::Local<v8::FunctionTemplate> is_in_net_ex_template =
         v8::FunctionTemplate::New(&IsInNetExCallback, v8_this_);
     global_template->Set(ASCIILiteralToV8String("isInNetEx"),
                          is_in_net_ex_template);
 
-    v8_context_ = v8::Persistent<v8::Context>::New(
+    v8_context_.Reset(
         isolate_, v8::Context::New(isolate_, NULL, global_template));
 
     v8::Context::Scope ctx(v8_context_);
 
     // Add the PAC utility functions to the environment.
     // (This script should never fail, as it is a string literal!)
     // Note that the two string literals are concatenated.
     int rv = RunScript(
         ASCIILiteralToV8String(
             PROXY_RESOLVER_SCRIPT
@@ skipping 294 matching lines @@
   if (!g_default_isolate_)
     return 0;
 
   v8::Locker locked(g_default_isolate_);
   v8::HeapStatistics heap_statistics;
   g_default_isolate_->GetHeapStatistics(&heap_statistics);
   return heap_statistics.used_heap_size();
 }
 
 }  // namespace net