Get rid of isolate state.

src/v8threads.cc

Index: src/v8threads.cc
diff --git a/src/v8threads.cc b/src/v8threads.cc
index 788786dbfdf683b9a2fea2120fcc6468d343145a..b799126563fd9c0eb88d9b1787b2dcf4e16d6d6d 100644
--- a/src/v8threads.cc
+++ b/src/v8threads.cc
@@ -37,15 +37,6 @@ void Locker::Initialize(v8::Isolate* isolate) {
     isolate_->thread_manager()->Lock();
     has_lock_ = true;
 
-    // Make sure that V8 is initialized.  Archiving of threads interferes
-    // with deserialization by adding additional root pointers, so we must
-    // initialize here, before anyone can call ~Locker() or Unlocker().
-    if (!isolate_->IsInitialized()) {
-      isolate_->Enter();
-      V8::Initialize();
-      isolate_->Exit();
-    }
-
     // This may be a locker within an unlocker in which case we have to
     // get the saved state for this thread and restore it.
     if (isolate_->thread_manager()->RestoreThread()) {