Re-write many calls to WrapUnique() with MakeUnique()

cc/raster/staging_buffer_pool.cc

Index: cc/raster/staging_buffer_pool.cc
diff --git a/cc/raster/staging_buffer_pool.cc b/cc/raster/staging_buffer_pool.cc
index 99fb43843105ece60a3ac000cbd3236ce601c003..ade400d9906ad3c07a5b92280775f3c91644e6ab 100644
--- a/cc/raster/staging_buffer_pool.cc
+++ b/cc/raster/staging_buffer_pool.cc
@@ -305,8 +305,8 @@ std::unique_ptr<StagingBuffer> StagingBufferPool::AcquireStagingBuffer(
 
   // Create new staging buffer if necessary.
   if (!staging_buffer) {
-    staging_buffer = base::WrapUnique(
-        new StagingBuffer(resource->size(), resource->format()));
+    staging_buffer =
+        base::MakeUnique<StagingBuffer>(resource->size(), resource->format());
     AddStagingBuffer(staging_buffer.get(), resource->format());
   }