[Isolates] Fix memory leaks in Isolate and Logger.

src/log.h

 // Copyright 2006-2008 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 279 matching lines @@
   INLINE(static LogEventsAndTags ToNativeByScript(LogEventsAndTags, Script*));
 
   // Profiler's sampling interval (in milliseconds).
   static const int kSamplingIntervalMs = 1;
 
   // Callback from Log, stops profiling in case of insufficient resources.
   void LogFailure();
 
  private:
   Logger();
+  ~Logger();
 
   // Size of window used for log records compression.
   static const int kCompressionWindowSize = 4;
 
   // Emits the profiler's first message.
   void ProfilerBeginEvent();
 
   // Emits callback event messages.
   void CallbackEventInternal(const char* prefix,
                              const char* name,
@@ skipping 99 matching lines @@
 // Class that extracts stack trace, used for profiling.
 class StackTracer : public AllStatic {
  public:
   static void Trace(TickSample* sample);
 };
 
 } }  // namespace v8::internal
 
 
 #endif  // V8_LOG_H_