Fix implicit access to raw pointer of scoped_refptr.

components/drive/drive_uploader.cc

Index: components/drive/drive_uploader.cc
diff --git a/components/drive/drive_uploader.cc b/components/drive/drive_uploader.cc
index 93a02876d7a8de8177a827c24da0e89434ebc862..2253c823daf4b57e54f5c769be11dbfa7c3f3770 100644
--- a/components/drive/drive_uploader.cc
+++ b/components/drive/drive_uploader.cc
@@ -200,7 +200,7 @@ CancelCallback DriveUploader::UploadNewFile(
 }
 
 void DriveUploader::StartBatchProcessing() {
-  DCHECK(current_batch_request_ == nullptr);
+  DCHECK(!current_batch_request_);
   current_batch_request_ =
       new RefCountedBatchRequest(drive_service_->StartBatchRequest());
 }