Revert of [tracing] Support ConvertableToTraceFormat argument type.

include/v8-platform.h

Index: include/v8-platform.h
diff --git a/include/v8-platform.h b/include/v8-platform.h
index e8ab9dca1ae4b7d07d7af5fcfefb1bd85dc54d28..d0b7aed8fc5a333bbef5281f8969db521e91c7af 100644
--- a/include/v8-platform.h
+++ b/include/v8-platform.h
@@ -7,8 +7,6 @@
 
 #include <stddef.h>
 #include <stdint.h>
-#include <memory>
-#include <string>
 
 namespace v8 {
 
@@ -19,38 +17,24 @@
  */
 class Task {
  public:
-  virtual ~Task() = default;
+  virtual ~Task() {}
 
   virtual void Run() = 0;
 };
 
+
 /**
- * An IdleTask represents a unit of work to be performed in idle time.
- * The Run method is invoked with an argument that specifies the deadline in
- * seconds returned by MonotonicallyIncreasingTime().
- * The idle task is expected to complete by this deadline.
- */
+* An IdleTask represents a unit of work to be performed in idle time.
+* The Run method is invoked with an argument that specifies the deadline in
+* seconds returned by MonotonicallyIncreasingTime().
+* The idle task is expected to complete by this deadline.
+*/
 class IdleTask {
  public:
-  virtual ~IdleTask() = default;
+  virtual ~IdleTask() {}
   virtual void Run(double deadline_in_seconds) = 0;
 };
 
-/**
- * The interface represents complex arguments to trace events.
- */
-class ConvertableToTraceFormat {
- public:
-  virtual ~ConvertableToTraceFormat() = default;
-
-  /**
-   * Append the class info to the provided |out| string. The appended
-   * data must be a valid JSON object. Strings must be properly quoted, and
-   * escaped. There is no processing applied to the content after it is
-   * appended.
-   */
-  virtual void AppendAsTraceFormat(std::string* out) const = 0;
-};
 
 /**
  * V8 Platform abstraction layer.
@@ -70,7 +54,7 @@
     kLongRunningTask
   };
 
-  virtual ~Platform() = default;
+  virtual ~Platform() {}
 
   /**
    * Gets the number of threads that are used to execute background tasks. Is
@@ -171,26 +155,6 @@
       const char* scope, uint64_t id, uint64_t bind_id, int32_t num_args,
       const char** arg_names, const uint8_t* arg_types,
       const uint64_t* arg_values, unsigned int flags) {
-    return AddTraceEvent(phase, category_enabled_flag, name, scope, id, bind_id,
-                         num_args, arg_names, arg_types, arg_values, nullptr,
-                         flags);
-  }
-
-  /**
-   * Adds a trace event to the platform tracing system. This function call is
-   * usually the result of a TRACE_* macro from trace_event_common.h when
-   * tracing and the category of the particular trace are enabled. It is not
-   * advisable to call this function on its own; it is really only meant to be
-   * used by the trace macros. The returned handle can be used by
-   * UpdateTraceEventDuration to update the duration of COMPLETE events.
-   */
-  virtual uint64_t AddTraceEvent(
-      char phase, const uint8_t* category_enabled_flag, const char* name,
-      const char* scope, uint64_t id, uint64_t bind_id, int32_t num_args,
-      const char** arg_names, const uint8_t* arg_types,
-      const uint64_t* arg_values,
-      std::unique_ptr<ConvertableToTraceFormat>* arg_convertables,
-      unsigned int flags) {
     return 0;
   }