Use exactly one of final, override, and virtual

minidump/minidump_context_writer.h

Index: minidump/minidump_context_writer.h
diff --git a/minidump/minidump_context_writer.h b/minidump/minidump_context_writer.h
index 91e7367b022e7eabf571f3f14d4d067b75273a13..3b50b36075a029b4bc9087c17c59310ef248a953 100644
--- a/minidump/minidump_context_writer.h
+++ b/minidump/minidump_context_writer.h
@@ -41,7 +41,7 @@ class MinidumpContextWriter : public internal::MinidumpWritable {
   virtual size_t ContextSize() const = 0;
 
   // MinidumpWritable:
-  virtual size_t SizeOfObject() override final;
+  size_t SizeOfObject() final;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MinidumpContextWriter);
@@ -67,10 +67,10 @@ class MinidumpContextX86Writer final : public MinidumpContextWriter {
 
  protected:
   // MinidumpWritable:
-  virtual bool WriteObject(FileWriterInterface* file_writer) override;
+  bool WriteObject(FileWriterInterface* file_writer) override;
 
   // MinidumpContextWriter:
-  virtual size_t ContextSize() const override;
+  size_t ContextSize() const override;
 
  private:
   MinidumpContextX86 context_;
@@ -98,11 +98,11 @@ class MinidumpContextAMD64Writer final : public MinidumpContextWriter {
 
  protected:
   // MinidumpWritable:
-  virtual size_t Alignment() override;
-  virtual bool WriteObject(FileWriterInterface* file_writer) override;
+  size_t Alignment() override;
+  bool WriteObject(FileWriterInterface* file_writer) override;
 
   // MinidumpContextWriter:
-  virtual size_t ContextSize() const override;
+  size_t ContextSize() const override;
 
  private:
   MinidumpContextAMD64 context_;