Convert various vector_as_array calls to vector::data.

device/serial/buffer.cc

Index: device/serial/buffer.cc
diff --git a/device/serial/buffer.cc b/device/serial/buffer.cc
index b5bf8883b970b4b9c5adf59ffbc103ce9fd78e28..2475e0161b258d846d1c10624e5e444f8246013e 100644
--- a/device/serial/buffer.cc
+++ b/device/serial/buffer.cc
@@ -3,7 +3,6 @@
 // found in the LICENSE file.
 
 #include "base/numerics/safe_conversions.h"
-#include "base/stl_util.h"
 #include "device/serial/buffer.h"
 #include "net/base/io_buffer.h"
 
@@ -23,7 +22,7 @@ SendBuffer::SendBuffer(
 SendBuffer::~SendBuffer() {}
 
 const char* SendBuffer::GetData() {
-  return vector_as_array(&data_);
+  return data_.data();
 }
 
 uint32_t SendBuffer::GetSize() {