Switch SupportsUserData uses to use unique_ptr.

content/browser/blob_storage/chrome_blob_storage_context.cc

Index: content/browser/blob_storage/chrome_blob_storage_context.cc
diff --git a/content/browser/blob_storage/chrome_blob_storage_context.cc b/content/browser/blob_storage/chrome_blob_storage_context.cc
index 935ffe37686552ec67ba8a7c613245f0d3b80612..0d0369a7f345e5561a6f6c1532ff39a5e3c5b793 100644
--- a/content/browser/blob_storage/chrome_blob_storage_context.cc
+++ b/content/browser/blob_storage/chrome_blob_storage_context.cc
@@ -218,7 +218,7 @@ void AttachRequestBodyBlobDataHandles(ResourceRequestBodyImpl* body,
     // Ensure the blob and any attached shareable files survive until
     // upload completion. The |body| takes ownership of |handle|.
     const void* key = handle.get();
-    body->SetUserData(key, handle.release());
+    body->SetUserData(key, std::move(handle));
   }
 }