convert //gpu to std::unique_ptr

gpu/vulkan/vulkan_command_pool.cc

Index: gpu/vulkan/vulkan_command_pool.cc
diff --git a/gpu/vulkan/vulkan_command_pool.cc b/gpu/vulkan/vulkan_command_pool.cc
index da7810397200fd41d64b72229be0b2a269ac9e10..9f741f3c57ae37d1dd0d78f47b9d6da4d38ef704 100644
--- a/gpu/vulkan/vulkan_command_pool.cc
+++ b/gpu/vulkan/vulkan_command_pool.cc
@@ -46,9 +46,9 @@ void VulkanCommandPool::Destroy() {
   }
 }
 
-scoped_ptr<VulkanCommandBuffer>
+std::unique_ptr<VulkanCommandBuffer>
 VulkanCommandPool::CreatePrimaryCommandBuffer() {
-  scoped_ptr<VulkanCommandBuffer> command_buffer(
+  std::unique_ptr<VulkanCommandBuffer> command_buffer(
       new VulkanCommandBuffer(device_queue_, this, true));
   if (!command_buffer->Initialize())
     return nullptr;
@@ -56,9 +56,9 @@ VulkanCommandPool::CreatePrimaryCommandBuffer() {
   return command_buffer;
 }
 
-scoped_ptr<VulkanCommandBuffer>
+std::unique_ptr<VulkanCommandBuffer>
 VulkanCommandPool::CreateSecondaryCommandBuffer() {
-  scoped_ptr<VulkanCommandBuffer> command_buffer(
+  std::unique_ptr<VulkanCommandBuffer> command_buffer(
       new VulkanCommandBuffer(device_queue_, this, false));
   if (!command_buffer->Initialize())
     return nullptr;