Fixed test memory leaks

src/log.cc

Index: src/log.cc
diff --git a/src/log.cc b/src/log.cc
index f3443faf053e731609dfbfb6779026d380565376..c4998c31fb321574f27058f4abef0690afd41e66 100644
--- a/src/log.cc
+++ b/src/log.cc
@@ -407,6 +407,7 @@ FILE* Logger::logfile_ = NULL;
 Profiler* Logger::profiler_ = NULL;
 Mutex* Logger::mutex_ = NULL;
 VMState* Logger::current_state_ = NULL;
+VMState Logger::bottom_state_(OTHER);
 SlidingStateWindow* Logger::sliding_state_window_ = NULL;
 
 #endif  // ENABLE_LOGGING_AND_PROFILING
@@ -1017,7 +1018,7 @@ bool Logger::Setup() {
     mutex_ = OS::CreateMutex();
   }
 
-  current_state_ = new VMState(OTHER);
+  current_state_ = &bottom_state_;
 
   // as log is initialized early with V8, we can assume that JS execution
   // frames can never reach this point on stack
@@ -1052,8 +1053,6 @@ void Logger::TearDown() {
     profiler_ = NULL;
   }
 
-  // Deleting the current_state_ has the side effect of assigning to it(!).
-  while (current_state_) delete current_state_;
   delete sliding_state_window_;
 
   delete ticker_;