[Tracing] Remove State Sampling Profiling

include/libplatform/v8-tracing.h

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_LIBPLATFORM_V8_TRACING_H_
 #define V8_LIBPLATFORM_V8_TRACING_H_
 
 #include <fstream>
 #include <memory>
 #include <unordered_set>
@@ skipping 167 matching lines @@
   // Echo to console. Events are discarded.
   ECHO_TO_CONSOLE,
 };
 
 class V8_PLATFORM_EXPORT TraceConfig {
  public:
   typedef std::vector<std::string> StringList;
 
   static TraceConfig* CreateDefaultTraceConfig();
 
-  TraceConfig()
-      : enable_sampling_(false),
-        enable_systrace_(false),
-        enable_argument_filter_(false) {}
+  TraceConfig() : enable_systrace_(false), enable_argument_filter_(false) {}
   TraceRecordMode GetTraceRecordMode() const { return record_mode_; }
-  bool IsSamplingEnabled() const { return enable_sampling_; }
   bool IsSystraceEnabled() const { return enable_systrace_; }
   bool IsArgumentFilterEnabled() const { return enable_argument_filter_; }
 
   void SetTraceRecordMode(TraceRecordMode mode) { record_mode_ = mode; }
-  void EnableSampling() { enable_sampling_ = true; }
   void EnableSystrace() { enable_systrace_ = true; }
   void EnableArgumentFilter() { enable_argument_filter_ = true; }
 
   void AddIncludedCategory(const char* included_category);
   void AddExcludedCategory(const char* excluded_category);
 
   bool IsCategoryGroupEnabled(const char* category_group) const;
 
  private:
   TraceRecordMode record_mode_;
-  bool enable_sampling_ : 1;
   bool enable_systrace_ : 1;
   bool enable_argument_filter_ : 1;
   StringList included_categories_;
   StringList excluded_categories_;
 
   // Disallow copy and assign
   TraceConfig(const TraceConfig&) = delete;
   void operator=(const TraceConfig&) = delete;
 };
 
@@ skipping 49 matching lines @@
   // Disallow copy and assign
   TracingController(const TracingController&) = delete;
   void operator=(const TracingController&) = delete;
 };
 
 }  // namespace tracing
 }  // namespace platform
 }  // namespace v8
 
 #endif  // V8_LIBPLATFORM_V8_TRACING_H_