Revert of tracing v2: Introduce TraceBufferWriter

components/tracing/test/fake_scattered_buffer.h

 // Copyright 2016 The Chromium 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 COMPONENTS_TRACING_TEST_FAKE_SCATTERED_BUFFER_H_
 #define COMPONENTS_TRACING_TEST_FAKE_SCATTERED_BUFFER_H_
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "components/tracing/core/scattered_stream_writer.h"
 #include "components/tracing/tracing_export.h"
 
 namespace tracing {
 namespace v2 {
 
 // A simple ScatteredStreamWriter::Delegate implementation which just allocates
 // chunks of a fixed size.
 class FakeScatteredBuffer : public ScatteredStreamWriter::Delegate {
  public:
   explicit FakeScatteredBuffer(size_t chunk_size);
-  ~FakeScatteredBuffer() override;
+  ~FakeScatteredBuffer();
 
   // ScatteredStreamWriter::Delegate implementation.
   ContiguousMemoryRange GetNewBuffer() override;
 
   std::string GetChunkAsString(int chunk_index);
 
   std::string GetBytesAsString(size_t start, size_t length);
 
   const std::vector<std::unique_ptr<uint8_t[]>>& chunks() const {
     return chunks_;
   }
 
  private:
   const size_t chunk_size_;
   std::vector<std::unique_ptr<uint8_t[]>> chunks_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeScatteredBuffer);
 };
 
 }  // namespace v2
 }  // namespace tracing
 
 #endif  // COMPONENTS_TRACING_TEST_FAKE_SCATTERED_BUFFER_H_