Update from https://crrev.com/316786

net/quic/quic_data_writer.cc

Index: net/quic/quic_data_writer.cc
diff --git a/net/quic/quic_data_writer.cc b/net/quic/quic_data_writer.cc
index be8b357668d6b08435da36b76d8f2fdd96e9be07..1c6e47fe6aa66d2ba7bdb18c535b4274e97c14bc 100644
--- a/net/quic/quic_data_writer.cc
+++ b/net/quic/quic_data_writer.cc
@@ -16,22 +16,15 @@ using std::numeric_limits;
 
 namespace net {
 
-QuicDataWriter::QuicDataWriter(size_t size)
-    : buffer_(new char[size]),
-      capacity_(size),
-      length_(0) {
+QuicDataWriter::QuicDataWriter(size_t size, char* buffer)
+    : buffer_(buffer), capacity_(size), length_(0) {
 }
 
 QuicDataWriter::~QuicDataWriter() {
-  delete[] buffer_;
 }
 
-char* QuicDataWriter::take() {
-  char* rv = buffer_;
-  buffer_ = nullptr;
-  capacity_ = 0;
-  length_ = 0;
-  return rv;
+char* QuicDataWriter::data() {
+  return buffer_;
 }
 
 bool QuicDataWriter::WriteUInt8(uint8 value) {