Use count-based profiling exclusively.

src/runtime-profiler.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 34 matching lines @@
 
   static void GlobalSetUp();
 
   static inline bool IsEnabled() {
     ASSERT(has_been_globally_set_up_);
     return enabled_;
   }
 
   void OptimizeNow();
 
-  void NotifyTick();
-
   void SetUp();
   void Reset();
   void TearDown();
 
   Object** SamplerWindowAddress();
   int SamplerWindowSize();
 
   void NotifyICChanged() { any_ic_changed_ = true; }
 
   // Rate limiting support.
@@ skipping 103 matching lines @@
 
 void RuntimeProfiler::IsolateExitedJS(Isolate* isolate) {
   Atomic32 new_state = NoBarrier_AtomicIncrement(&state_, -1);
   ASSERT(new_state >= 0);
   USE(new_state);
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_RUNTIME_PROFILER_H_