Use vectors instead of IOBuffer for U2fPackets

device/u2f/u2f_message_fuzzer.cc

Index: device/u2f/u2f_message_fuzzer.cc
diff --git a/device/u2f/u2f_message_fuzzer.cc b/device/u2f/u2f_message_fuzzer.cc
index 2d0c0d8cfaf8790fc60ae1cc69bc5600d20b0d15..bdc159d918db8de7631b6b6f05362a7bc6c1824c 100644
--- a/device/u2f/u2f_message_fuzzer.cc
+++ b/device/u2f/u2f_message_fuzzer.cc
@@ -5,17 +5,17 @@
 #include <stddef.h>
 #include <stdint.h>
 #include <algorithm>
+#include <vector>
 #include "net/base/io_buffer.h"
 #include "u2f_message.h"
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
   size_t packet_size = 65;
   size_t remaining_buffer = size;
-  uint8_t* start = const_cast<uint8_t*>(data);
+  const uint8_t* start = data;
 
-  scoped_refptr<net::IOBufferWithSize> buf(
-      new net::IOBufferWithSize(packet_size));
-  memcpy(buf->data(), start, std::min(packet_size, remaining_buffer));
+  std::vector<uint8_t> buf(start,
+                           start + std::min(packet_size, remaining_buffer));
   std::unique_ptr<device::U2fMessage> msg =
       device::U2fMessage::CreateFromSerializedData(buf);
 
@@ -24,9 +24,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
 
   while (remaining_buffer > 0) {
     size_t buffer_size = std::min(packet_size, remaining_buffer);
-    scoped_refptr<net::IOBufferWithSize> tmp_buf(
-        new net::IOBufferWithSize(buffer_size));
-    memcpy(tmp_buf->data(), start, buffer_size);
+    std::vector<uint8_t> tmp_buf(start, start + buffer_size);
     msg->AddContinuationPacket(tmp_buf);
     remaining_buffer -= std::min(remaining_buffer, buffer_size);
     start += buffer_size;