Use exactly one of final, override, and virtual

minidump/minidump_file_writer.h

Index: minidump/minidump_file_writer.h
diff --git a/minidump/minidump_file_writer.h b/minidump/minidump_file_writer.h
index bc9753d2c2deae1af2f6628dfab0d1c522ba47ad..2faa35b03bae1d4b54f2df71edf0f688886c9101 100644
--- a/minidump/minidump_file_writer.h
+++ b/minidump/minidump_file_writer.h
@@ -62,15 +62,15 @@ class MinidumpFileWriter final : public internal::MinidumpWritable {
   //! rewinds to the beginning of the file and writes the correct value for this
   //! field. This prevents incompletely-written minidump files from being
   //! mistaken for valid ones.
-  virtual bool WriteEverything(FileWriterInterface* file_writer) override;
+  bool WriteEverything(FileWriterInterface* file_writer) override;
 
  protected:
   // MinidumpWritable:
-  virtual bool Freeze() override;
-  virtual size_t SizeOfObject() override;
-  virtual std::vector<MinidumpWritable*> Children() override;
-  virtual bool WillWriteAtOffsetImpl(off_t offset) override;
-  virtual bool WriteObject(FileWriterInterface* file_writer) override;
+  bool Freeze() override;
+  size_t SizeOfObject() override;
+  std::vector<MinidumpWritable*> Children() override;
+  bool WillWriteAtOffsetImpl(off_t offset) override;
+  bool WriteObject(FileWriterInterface* file_writer) override;
 
  private:
   MINIDUMP_HEADER header_;