Move StackTracer to sampler.h

src/log.h

 // Copyright 2012 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 448 matching lines @@
   // An array of log events names.
   const char* const* log_events_;
 
   // Internal implementation classes with access to
   // private members.
   friend class EventLog;
   friend class Isolate;
   friend class LogMessageBuilder;
   friend class TimeLog;
   friend class Profiler;
-  friend class StackTracer;
   friend class VMState;
 
   friend class LoggerTestHelper;
 
 
   int logging_nesting_;
   int cpu_profiler_nesting_;
 
   Log* log_;
 
@@ skipping 18 matching lines @@
   Address prev_to_;
   //  Logger::FunctionCreateEvent(...)
   Address prev_code_;
 
   int64_t epoch_;
 
   friend class CpuProfiler;
 };
 
 
-// Class that extracts stack trace, used for profiling.
-class StackTracer : public AllStatic {
- public:
-  static void Trace(Isolate* isolate, TickSample* sample);
-};
-
 } }  // namespace v8::internal
 
 
 #endif  // V8_LOG_H_