Revert "Re-add top-level v8::Locker"

The locker makes node crash in debug mode sometimes.
For example, test/simple/test-repl.js triggers it.

This reverts commit 9a6012edd9.

Conflicts:

	src/node.cc

src/node.cc

@@ -2759,39 +2759,33 @@ int Start(int argc, char *argv[]) {
   // Use copy here as to not modify the original argv:
   Init(argc, argv_copy);
 
-  V8::Initialize();
-  Persistent<Context> context;
-  {
-    Locker locker;
-    HandleScope handle_scope;
-
-    // Create the one and only Context.
-    Persistent<Context> context = Context::New();
-    Context::Scope context_scope(context);
-
-    // Use original argv, as we're just copying values out of it.
-    Handle<Object> process_l = SetupProcessObject(argc, argv);
-    v8_typed_array::AttachBindings(context->Global());
-
-    // Create all the objects, load modules, do everything.
-    // so your next reading stop should be node::Load()!
-    Load(process_l);
-
-    // All our arguments are loaded. We've evaluated all of the scripts. We
-    // might even have created TCP servers. Now we enter the main eventloop. If
-    // there are no watchers on the loop (except for the ones that were
-    // uv_unref'd) then this function exits. As long as there are active
-    // watchers, it blocks.
-    uv_run(uv_default_loop());
-
-    EmitExit(process_l);
-#ifndef NDEBUG
-    context.Dispose();
-#endif
-  }
+  v8::V8::Initialize();
+  v8::HandleScope handle_scope;
+
+  // Create the one and only Context.
+  Persistent<v8::Context> context = v8::Context::New();
+  v8::Context::Scope context_scope(context);
+
+  // Use original argv, as we're just copying values out of it.
+  Handle<Object> process_l = SetupProcessObject(argc, argv);
+  v8_typed_array::AttachBindings(context->Global());
+
+  // Create all the objects, load modules, do everything.
+  // so your next reading stop should be node::Load()!
+  Load(process_l);
+
+  // All our arguments are loaded. We've evaluated all of the scripts. We
+  // might even have created TCP servers. Now we enter the main eventloop. If
+  // there are no watchers on the loop (except for the ones that were
+  // uv_unref'd) then this function exits. As long as there are active
+  // watchers, it blocks.
+  uv_run(uv_default_loop());
+
+  EmitExit(process_l);
 
 #ifndef NDEBUG
   // Clean up.
+  context.Dispose();
   V8::Dispose();
 #endif  // NDEBUG