convert //gpu to std::unique_ptr

gpu/command_buffer/service/transfer_buffer_manager.cc

Index: gpu/command_buffer/service/transfer_buffer_manager.cc
diff --git a/gpu/command_buffer/service/transfer_buffer_manager.cc b/gpu/command_buffer/service/transfer_buffer_manager.cc
index f9db75e062d3f2b0e9e299b3a778deb0b36e7dfa..2e1e8b39eaad672c911a0c8c14da114fd4f7bae0 100644
--- a/gpu/command_buffer/service/transfer_buffer_manager.cc
+++ b/gpu/command_buffer/service/transfer_buffer_manager.cc
@@ -7,9 +7,9 @@
 #include <stdint.h>
 
 #include <limits>
+#include <memory>
 
 #include "base/logging.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/process/process_handle.h"
 #include "base/strings/stringprintf.h"
 #include "base/thread_task_runner_handle.h"
@@ -58,7 +58,7 @@ bool TransferBufferManager::Initialize() {
 
 bool TransferBufferManager::RegisterTransferBuffer(
     int32_t id,
-    scoped_ptr<BufferBacking> buffer_backing) {
+    std::unique_ptr<BufferBacking> buffer_backing) {
   if (id <= 0) {
     DVLOG(0) << "Cannot register transfer buffer with non-positive ID.";
     return false;