[Fuchsia] Switch to cwriter tracing API.

runtime/vm/timeline.h

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef RUNTIME_VM_TIMELINE_H_
 #define RUNTIME_VM_TIMELINE_H_
 
 #include "include/dart_tools_api.h"
 
 #include "vm/allocation.h"
@@ skipping 735 matching lines @@
 };
 
 #if defined(HOST_OS_FUCHSIA)
 // A recorder that sends events to Fuchsia's tracing app. Events are also stored
 // in a buffer of fixed capacity. When the buffer is full, new events overwrite
 // old events.
 // See: https://fuchsia.googlesource.com/tracing/+/HEAD/docs/usage_guide.md
 class TimelineEventFuchsiaRecorder : public TimelineEventFixedBufferRecorder {
  public:
   explicit TimelineEventFuchsiaRecorder(intptr_t capacity = kDefaultCapacity);
-  virtual ~TimelineEventFuchsiaRecorder() {}
+  virtual ~TimelineEventFuchsiaRecorder();
 
   const char* name() const { return "Fuchsia"; }
 
  protected:
   TimelineEventBlock* GetNewBlockLocked();
   void CompleteEvent(TimelineEvent* event);
 };
 #endif  // defined(HOST_OS_FUCHSIA)
 
 // A recorder that stores events in a buffer of fixed capacity. When the buffer
@@ skipping 77 matching lines @@
   TimelineEventBlock* Next();
 
  private:
   TimelineEventBlock* current_;
   TimelineEventRecorder* recorder_;
 };
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_TIMELINE_H_