Fix make_unique casing. (#2350)

iree/hal/vulkan/timepoint_util.cc

diff --git a/iree/hal/vulkan/timepoint_util.cc b/iree/hal/vulkan/timepoint_util.cc
index d8f2639..98e9f96 100644
--- a/iree/hal/vulkan/timepoint_util.cc
+++ b/iree/hal/vulkan/timepoint_util.cc
@@ -118,7 +118,7 @@
       VK_RETURN_IF_ERROR(syms()->vkCreateFence(*logical_device_, &create_info,
                                                logical_device_->allocator(),
                                                &fence));
-      fences[i] = absl::MakeUnique<TimePointFence>(this, fence);
+      fences[i] = absl::make_unique<TimePointFence>(this, fence);
     }
   }