Standardize usage of virtual/override/final in content/browser/

content/browser/loader/upload_data_stream_builder.cc

Index: content/browser/loader/upload_data_stream_builder.cc
diff --git a/content/browser/loader/upload_data_stream_builder.cc b/content/browser/loader/upload_data_stream_builder.cc
index 45b22b6b892e703be9a4529444a61029eb4f1639..6419ead79631a1d9ccb3919f671be5200a5f9c5a 100644
--- a/content/browser/loader/upload_data_stream_builder.cc
+++ b/content/browser/loader/upload_data_stream_builder.cc
@@ -30,7 +30,7 @@ class BytesElementReader : public net::UploadBytesElementReader {
     DCHECK_EQ(ResourceRequestBody::Element::TYPE_BYTES, element.type());
   }
 
-  virtual ~BytesElementReader() {}
+  ~BytesElementReader() override {}
 
  private:
   scoped_refptr<ResourceRequestBody> resource_request_body_;
@@ -55,7 +55,7 @@ class FileElementReader : public net::UploadFileElementReader {
     DCHECK_EQ(ResourceRequestBody::Element::TYPE_FILE, element.type());
   }
 
-  virtual ~FileElementReader() {}
+  ~FileElementReader() override {}
 
  private:
   scoped_refptr<ResourceRequestBody> resource_request_body_;