convert //gpu to std::unique_ptr

gpu/vulkan/vulkan_surface.cc

Index: gpu/vulkan/vulkan_surface.cc
diff --git a/gpu/vulkan/vulkan_surface.cc b/gpu/vulkan/vulkan_surface.cc
index 8d1bbab9c46fa6fd5245e7a6e9ca1234a7a4d98a..c08b5e9af187c4eb846a3129473242ce83498744 100644
--- a/gpu/vulkan/vulkan_surface.cc
+++ b/gpu/vulkan/vulkan_surface.cc
@@ -158,9 +158,9 @@ bool VulkanSurface::InitializeOneOff() {
 VulkanSurface::~VulkanSurface() {}
 
 // static
-scoped_ptr<VulkanSurface> VulkanSurface::CreateViewSurface(
+std::unique_ptr<VulkanSurface> VulkanSurface::CreateViewSurface(
     gfx::AcceleratedWidget window) {
-  return scoped_ptr<VulkanSurface>(new VulkanWSISurface(window));
+  return std::unique_ptr<VulkanSurface>(new VulkanWSISurface(window));
 }
 
 VulkanSurface::VulkanSurface() {}