Removed MallocHookScope and replaced it with MallocLocker, which behaves like MutexLocker but also …

runtime/vm/os_thread.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef RUNTIME_VM_OS_THREAD_H_
 #define RUNTIME_VM_OS_THREAD_H_
 
 #include "platform/globals.h"
 #include "vm/allocation.h"
 #include "vm/globals.h"
@@ skipping 273 matching lines @@
  private:
   void Lock();
   bool TryLock();  // Returns false if lock is busy and locking failed.
   void Unlock();
 
   MutexData data_;
 #if defined(DEBUG)
   ThreadId owner_;
 #endif  // defined(DEBUG)
 
+  friend class MallocLocker;
   friend class MutexLocker;
   friend class SafepointMutexLocker;
   friend class OSThreadIterator;
   friend class TimelineEventBlockIterator;
   friend class TimelineEventRecorder;
   friend class PageSpace;
   friend void Dart_TestMutex();
   DISALLOW_COPY_AND_ASSIGN(Mutex);
 };
 
@@ skipping 40 matching lines @@
   friend class SafepointMonitorLocker;
   friend void Dart_TestMonitor();
   DISALLOW_COPY_AND_ASSIGN(Monitor);
 };
 
 
 }  // namespace dart
 
 
 #endif  // RUNTIME_VM_OS_THREAD_H_