make v8::Locker not use Isolate::GetCurrent()

src/v8threads.cc

Index: src/v8threads.cc
diff --git a/src/v8threads.cc b/src/v8threads.cc
index 94a5e8051da9d1a28ab7193cd4f8df7e4e6c69c6..cc4f43965f3528e8272e4ac85beaa5f527f9060f 100644
--- a/src/v8threads.cc
+++ b/src/v8threads.cc
@@ -42,11 +42,6 @@ namespace v8 {
 bool Locker::active_ = false;
 
 
-Locker::Locker() {
-  Initialize(i::Isolate::GetDefaultIsolateForLocking());
-}
-
-
 // Once the Locker is initialized, the current thread will be guaranteed to have
 // the lock for a given isolate.
 void Locker::Initialize(v8::Isolate* isolate) {
@@ -116,11 +111,6 @@ Locker::~Locker() {
 }
 
 
-Unlocker::Unlocker() {
-  Initialize(i::Isolate::GetDefaultIsolateForLocking());
-}
-
-
 void Unlocker::Initialize(v8::Isolate* isolate) {
   ASSERT(isolate != NULL);
   isolate_ = reinterpret_cast<i::Isolate*>(isolate);
@@ -143,14 +133,15 @@ Unlocker::~Unlocker() {
 }
 
 
-void Locker::StartPreemption(int every_n_ms) {
+void Locker::StartPreemption(v8::Isolate* isolate, int every_n_ms) {
   v8::internal::ContextSwitcher::StartPreemption(
-      i::Isolate::Current(), every_n_ms);
+      reinterpret_cast<i::Isolate*>(isolate), every_n_ms);
 }
 
 
-void Locker::StopPreemption() {
-  v8::internal::ContextSwitcher::StopPreemption(i::Isolate::Current());
+void Locker::StopPreemption(v8::Isolate* isolate) {
+  v8::internal::ContextSwitcher::StopPreemption(
+      reinterpret_cast<i::Isolate*>(isolate));
 }