convert //gpu to std::unique_ptr

gpu/vulkan/vulkan_device_queue.cc

Index: gpu/vulkan/vulkan_device_queue.cc
diff --git a/gpu/vulkan/vulkan_device_queue.cc b/gpu/vulkan/vulkan_device_queue.cc
index 17fc1a39e2c48466cc84f24f4f67591e052f6c66..aa6f987c7a62c9bef0e1489c3b6e7960f311448a 100644
--- a/gpu/vulkan/vulkan_device_queue.cc
+++ b/gpu/vulkan/vulkan_device_queue.cc
@@ -166,8 +166,8 @@ void VulkanDeviceQueue::Destroy() {
   vk_physical_device_ = VK_NULL_HANDLE;
 }
 
-scoped_ptr<VulkanCommandPool> VulkanDeviceQueue::CreateCommandPool() {
-  scoped_ptr<VulkanCommandPool> command_pool(new VulkanCommandPool(this));
+std::unique_ptr<VulkanCommandPool> VulkanDeviceQueue::CreateCommandPool() {
+  std::unique_ptr<VulkanCommandPool> command_pool(new VulkanCommandPool(this));
   if (!command_pool->Initialize())
     return nullptr;