Revert of Refactor CpuProfiler.

src/log.h

Index: src/log.h
diff --git a/src/log.h b/src/log.h
index 303e352898a0cd76a8774be863fbe787e3b56d65..91331f04fc068c0ad3b16149a70bc85971896a14 100644
--- a/src/log.h
+++ b/src/log.h
@@ -89,7 +89,6 @@
 class PerfBasicLogger;
 class LowLevelLogger;
 class PerfJitLogger;
-class ProfilerListener;
 
 class Logger : public CodeEventListener {
  public:
@@ -102,15 +101,7 @@
   void SetCodeEventHandler(uint32_t options,
                            JitCodeEventHandler event_handler);
 
-  // Sets up ProfilerListener.
-  void SetUpProfilerListener();
-
-  // Tear down ProfilerListener if it has no observers.
-  void TearDownProfilerListener();
-
   sampler::Sampler* sampler();
-
-  ProfilerListener* profiler_listener() { return profiler_listener_.get(); }
 
   // Frees resources acquired in SetUp.
   // When a temporary file is used for the log, returns its stream descriptor,
@@ -341,7 +332,6 @@
   PerfJitLogger* perf_jit_logger_;
   LowLevelLogger* ll_logger_;
   JitLogger* jit_logger_;
-  std::unique_ptr<ProfilerListener> profiler_listener_;
   List<CodeEventListener*> listeners_;
 
   // Guards against multiple calls to TearDown() that can happen in some tests.