Make the v8 Isolate used in the proxy resolver explicit.

chrome/browser/io_thread.cc

Index: chrome/browser/io_thread.cc
diff --git a/chrome/browser/io_thread.cc b/chrome/browser/io_thread.cc
index 3740513eb525545e55c466265a32dee3f95f1576..47dfc6251c51e30c573976e5b0e1bf5b04deef49 100644
--- a/chrome/browser/io_thread.cc
+++ b/chrome/browser/io_thread.cc
@@ -61,6 +61,7 @@
 #include "net/url_request/url_fetcher.h"
 #include "net/url_request/url_request_throttler_manager.h"
 #include "net/websockets/websocket_job.h"
+#include "v8/include/v8.h"
 
 #if defined(ENABLE_CONFIGURATION_POLICY)
 #include "policy/policy_constants.h"
@@ -366,7 +367,10 @@ IOThread::IOThread(
       globals_(NULL),
       sdch_manager_(NULL),
       is_spdy_disabled_by_policy_(false),
-      ALLOW_THIS_IN_INITIALIZER_LIST(weak_factory_(this)) {
+      ALLOW_THIS_IN_INITIALIZER_LIST(weak_factory_(this)),
+      v8_default_isolate_(v8::Isolate::GetCurrent()) {
+  DCHECK(v8_default_isolate_);
+
   // We call RegisterPrefs() here (instead of inside browser_prefs.cc) to make
   // sure that everything is initialized in the right order.
   //
@@ -545,6 +549,8 @@ void IOThread::Init() {
   globals_->proxy_script_fetcher_context.reset(
       ConstructProxyScriptFetcherContext(globals_, net_log_));
 
+  globals_->v8_default_isolate = v8_default_isolate_;
+
   sdch_manager_ = new net::SdchManager();
 
 #if defined(OS_MACOSX) && !defined(OS_IOS)
@@ -875,6 +881,7 @@ void IOThread::InitSystemRequestContextOnIOThread() {
           net_log_,
           globals_->proxy_script_fetcher_context.get(),
           system_proxy_config_service_.release(),
+          v8_default_isolate_,
           command_line));
 
   net::HttpNetworkSession::Params system_params;