Make net use v8 through gin

net/proxy/proxy_resolver_v8.h

 // Copyright (c) 2011 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.
 
 #ifndef NET_PROXY_PROXY_RESOLVER_V8_H_
 #define NET_PROXY_PROXY_RESOLVER_V8_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "net/base/net_export.h"
 #include "net/proxy/proxy_resolver.h"
 
+namespace gin {
+class IsolateHolder;
+}  // namespace gin
+
 namespace v8 {
 class HeapStatistics;
 class Isolate;
 }  // namespace v8
 
 namespace net {
 
 // Implementation of ProxyResolver that uses V8 to evaluate PAC scripts.
 //
 // ----------------------------------------------------------------------------
@@ skipping 60 matching lines @@
                              const net::CompletionCallback& /*callback*/,
                              RequestHandle* /*request*/,
                              const BoundNetLog& net_log) OVERRIDE;
   virtual void CancelRequest(RequestHandle request) OVERRIDE;
   virtual LoadState GetLoadState(RequestHandle request) const OVERRIDE;
   virtual void CancelSetPacScript() OVERRIDE;
   virtual int SetPacScript(
       const scoped_refptr<ProxyResolverScriptData>& script_data,
       const net::CompletionCallback& /*callback*/) OVERRIDE;
 
-  // Remember the default Isolate, must be called from the main thread. This
-  // hack can be removed when the "default Isolate" concept is gone.
-  static void RememberDefaultIsolate();
-
-#if defined(OS_WIN)
-  // Create an isolate to use for the proxy resolver. Until the "default
-  // Isolate" concept is gone, it is preferable to invoke
-  // RememberDefaultIsolate() as creating a new Isolate in additional to the
-  // default Isolate will waste a few MB of memory and the runtime it took to
-  // create the default Isolate.
-  static void CreateIsolate();
-#endif
+  // Create an isolate to use for the proxy resolver. If the embedder invokes
+  // this method multiple times, it must be invoked in a thread safe manner,
+  // e.g. always from the same thread.
+  static void EnsureIsolateCreated();
 
   static v8::Isolate* GetDefaultIsolate();
 
   // Get total/ued heap memory usage of all v8 instances used by the proxy
   // resolver.
   static size_t GetTotalHeapSize();
   static size_t GetUsedHeapSize();
 
  private:
-  static v8::Isolate* g_default_isolate_;
+  static gin::IsolateHolder* g_proxy_resolver_isolate_;
 
   // Context holds the Javascript state for the most recently loaded PAC
   // script. It corresponds with the data from the last call to
   // SetPacScript().
   class Context;
 
   scoped_ptr<Context> context_;
 
   JSBindings* js_bindings_;
 
   DISALLOW_COPY_AND_ASSIGN(ProxyResolverV8);
 };
 
 }  // namespace net
 
 #endif  // NET_PROXY_PROXY_RESOLVER_V8_H_