crashpad_database_util: Accept --new-report=- to read a new report from standard input

util/file/string_file.h

Index: util/file/string_file.h
diff --git a/util/file/string_file.h b/util/file/string_file.h
index b6876b328f20c0362d27f0fd8c2e500487dcc1f0..c2e18ada2787cb8b132c38f3381c921b68b4b106 100644
--- a/util/file/string_file.h
+++ b/util/file/string_file.h
@@ -36,7 +36,7 @@ namespace crashpad {
 class StringFile : public FileReaderInterface, public FileWriterInterface {
  public:
   StringFile();
-  ~StringFile();
+  ~StringFile() override;
 
   //! \brief Returns a string containing the virtual file’s contents.
   const std::string& string() const { return string_; }