Lazily initialize the v8::Isolate used by ProxyResolverV8 (in the browser process).

net/proxy/mojo_proxy_resolver_factory_impl.cc

 // Copyright 2015 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/mojo_proxy_resolver_factory_impl.h"
 
 #include "net/dns/host_resolver_mojo.h"
 #include "net/proxy/mojo_proxy_resolver_impl.h"
 #include "net/proxy/proxy_resolver_v8.h"
 #include "net/proxy/proxy_resolver_v8_tracing.h"
 #include "third_party/mojo/src/mojo/public/cpp/bindings/error_handler.h"
 
 namespace net {
 namespace {
 
 scoped_ptr<ProxyResolver> CreateDefaultProxyResolver(
     HostResolver* host_resolver) {
-  ProxyResolverV8::EnsureIsolateCreated();
   return make_scoped_ptr(
       new ProxyResolverV8Tracing(host_resolver, nullptr, nullptr));
 }
 
 // A class to manage the lifetime of a MojoProxyResolverImpl and a
 // HostResolverMojo. An instance will remain while the message pipes for both
 // mojo connections remain open.
 class MojoProxyResolverHolder : public mojo::ErrorHandler {
  public:
   MojoProxyResolverHolder(
@@ skipping 49 matching lines @@
     mojo::InterfaceRequest<interfaces::ProxyResolver> request,
     interfaces::HostResolverPtr host_resolver) {
   // The MojoProxyResolverHolder will delete itself when either |request| or
   // |host_resolver| encounters a connection error, that is, when either the
   // ProxyResolver client or the HostResolver implementation is deleted.
   new MojoProxyResolverHolder(proxy_resolver_impl_factory_, request.Pass(),
                               host_resolver.Pass());
 }
 
 }  // namespace net