Make the v8 Isolate used in the proxy resolver explicit.

net/proxy/proxy_resolver_v8_unittest.cc

Index: net/proxy/proxy_resolver_v8_unittest.cc
diff --git a/net/proxy/proxy_resolver_v8_unittest.cc b/net/proxy/proxy_resolver_v8_unittest.cc
index b93d4f3e43fe16d0fc0afa2d2b905acf1fb5cbed..22ee253178773573dcd5be4fc41c6ba819bcb550 100644
--- a/net/proxy/proxy_resolver_v8_unittest.cc
+++ b/net/proxy/proxy_resolver_v8_unittest.cc
@@ -15,6 +15,7 @@
 #include "net/proxy/proxy_resolver_js_bindings.h"
 #include "net/proxy/proxy_resolver_v8.h"
 #include "testing/gtest/include/gtest/gtest.h"
+#include "v8/include/v8.h"
 
 namespace net {
 namespace {
@@ -88,7 +89,8 @@ class MockJSBindings : public ProxyResolverJSBindings {
 // disk.
 class ProxyResolverV8WithMockBindings : public ProxyResolverV8 {
  public:
-  ProxyResolverV8WithMockBindings() : ProxyResolverV8(new MockJSBindings()) {}
+  ProxyResolverV8WithMockBindings()
+      : ProxyResolverV8(new MockJSBindings(), v8::Isolate::GetCurrent()) {}
 
   MockJSBindings* mock_js_bindings() const {
     return reinterpret_cast<MockJSBindings*>(js_bindings());