Do not start sampler thread when CpuProfiler is active

src/log.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 608 matching lines @@
   }
 
   void SetProfiler(Profiler* profiler) {
     ASSERT(profiler_ == NULL);
     profiler_ = profiler;
     IncreaseProfilingDepth();
     if (!IsActive()) Start();
   }
 
   void ClearProfiler() {
-    DecreaseProfilingDepth();
     profiler_ = NULL;
     if (IsActive()) Stop();
+    DecreaseProfilingDepth();
   }
 
  private:
   Profiler* profiler_;
 };
 
 
 //
 // Profiler implementation.
 //
@@ skipping 1264 matching lines @@
   if (jit_logger_) {
     removeCodeEventListener(jit_logger_);
     delete jit_logger_;
     jit_logger_ = NULL;
   }
 
   return log_->Close();
 }
 
 } }  // namespace v8::internal