Revert of tracing v2: Introduce TraceBufferWriter

components/tracing/core/trace_ring_buffer_unittest.cc

Index: components/tracing/core/trace_ring_buffer_unittest.cc
diff --git a/components/tracing/core/trace_ring_buffer_unittest.cc b/components/tracing/core/trace_ring_buffer_unittest.cc
index 5a1a41b3b1303abd9dcac220a8fc882ad4ce7fa7..34104bd15459a8e9a5da79c704ce027ea27f2a82 100644
--- a/components/tracing/core/trace_ring_buffer_unittest.cc
+++ b/components/tracing/core/trace_ring_buffer_unittest.cc
@@ -10,6 +10,8 @@
 namespace v2 {
 
 namespace {
+
+const size_t kChunkSize = TraceRingBuffer::Chunk::kSize;
 
 TEST(TraceRingBufferTest, BasicChunkWrapping) {
   const uint32_t kNumChunks = 5;
@@ -48,7 +50,7 @@
 
 TEST(TraceRingBufferTest, ChunkBankrupcyDoesNotCrash) {
   const size_t kNumChunks = 2;
-  const size_t kBufferSize = kChunkSize * kNumChunks;
+  const size_t kBufferSize = TraceRingBuffer::Chunk::kSize * kNumChunks;
   std::unique_ptr<uint8_t[]> storage(new uint8_t[kBufferSize]);
   TraceRingBuffer ring_buffer(storage.get(), kBufferSize);