Revert of [Tracing] V8 Tracing Controller

src/libplatform/default-platform.cc

Index: src/libplatform/default-platform.cc
diff --git a/src/libplatform/default-platform.cc b/src/libplatform/default-platform.cc
index 2f81248ec189cefddeeb3ba7d12b898fdecdc7c4..71ee6bee980372a17ac6d33e5e16e794e1aa21be 100644
--- a/src/libplatform/default-platform.cc
+++ b/src/libplatform/default-platform.cc
@@ -29,17 +29,11 @@
   return reinterpret_cast<DefaultPlatform*>(platform)->PumpMessageLoop(isolate);
 }
 
-void SetTracingController(
-    v8::Platform* platform,
-    v8::platform::tracing::TracingController* tracing_controller) {
-  return reinterpret_cast<DefaultPlatform*>(platform)->SetTracingController(
-      tracing_controller);
-}
-
 const int DefaultPlatform::kMaxThreadPoolSize = 8;
 
 DefaultPlatform::DefaultPlatform()
-    : initialized_(false), thread_pool_size_(0), tracing_controller_(NULL) {}
+    : initialized_(false), thread_pool_size_(0) {}
+
 
 DefaultPlatform::~DefaultPlatform() {
   base::LockGuard<base::Mutex> guard(&lock_);
@@ -63,11 +57,6 @@
       i->second.pop();
     }
   }
-
-  if (tracing_controller_) {
-    tracing_controller_->StopTracing();
-    delete tracing_controller_;
-  }
 }
 
 
@@ -184,27 +173,15 @@
     const char* scope, uint64_t id, uint64_t bind_id, int num_args,
     const char** arg_names, const uint8_t* arg_types,
     const uint64_t* arg_values, unsigned int flags) {
-  if (tracing_controller_) {
-    return tracing_controller_->AddTraceEvent(
-        phase, category_enabled_flag, name, scope, id, bind_id, num_args,
-        arg_names, arg_types, arg_values, flags);
-  }
-
   return 0;
 }
 
+
 void DefaultPlatform::UpdateTraceEventDuration(
-    const uint8_t* category_enabled_flag, const char* name, uint64_t handle) {
-  if (tracing_controller_) {
-    tracing_controller_->UpdateTraceEventDuration(category_enabled_flag, name,
-                                                  handle);
-  }
-}
+    const uint8_t* category_enabled_flag, const char* name, uint64_t handle) {}
+
 
 const uint8_t* DefaultPlatform::GetCategoryGroupEnabled(const char* name) {
-  if (tracing_controller_) {
-    return tracing_controller_->GetCategoryGroupEnabled(name);
-  }
   static uint8_t no = 0;
   return &no;
 }
@@ -216,10 +193,6 @@
   return dummy;
 }
 
-void DefaultPlatform::SetTracingController(
-    tracing::TracingController* tracing_controller) {
-  tracing_controller_ = tracing_controller;
-}
 
 size_t DefaultPlatform::NumberOfAvailableBackgroundThreads() {
   return static_cast<size_t>(thread_pool_size_);