Localize counter class member functions.

src/isolate.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/isolate.h"
 
 #include <stdlib.h>
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <sstream>
@@ skipping 2619 matching lines @@
     handler->has_terminated_ = false;
     handler->exception_ = pending_exception();
     // Propagate to the external try-catch only if we got an actual message.
     if (thread_local_top_.pending_message_obj_->IsTheHole(this)) return true;
 
     handler->message_obj_ = thread_local_top_.pending_message_obj_;
   }
   return true;
 }
 
-static base::LazyMutex initialize_counters_mutex = LAZY_MUTEX_INITIALIZER;
-
 bool Isolate::InitializeCounters() {
   if (counters_ != nullptr) return false;
-  base::LockGuard<base::Mutex> guard(initialize_counters_mutex.Pointer());
-  if (counters_ != nullptr) return false;
   counters_shared_ = std::make_shared<Counters>(this);
   counters_ = counters_shared_.get();
   return true;
 }
 
 void Isolate::InitializeLoggingAndCounters() {
   if (logger_ == NULL) {
     logger_ = new Logger(this);
   }
   InitializeCounters();
@@ skipping 1131 matching lines @@
   // Then check whether this scope intercepts.
   if ((flag & intercept_mask_)) {
     intercepted_flags_ |= flag;
     return true;
   }
   return false;
 }
 
 }  // namespace internal
 }  // namespace v8