Check implementation files for virtual and OVERRIDE

tools/clang/plugins/tests/virtual_methods.cpp

Index: tools/clang/plugins/tests/virtual_methods.cpp
diff --git a/tools/clang/plugins/tests/virtual_methods.cpp b/tools/clang/plugins/tests/virtual_methods.cpp
index 05515b79835bf51b3486608ff043ea6e9d4d1b49..f1976a42037fe937a6939d4d8206803de9fd4498 100644
--- a/tools/clang/plugins/tests/virtual_methods.cpp
+++ b/tools/clang/plugins/tests/virtual_methods.cpp
@@ -16,13 +16,13 @@ class VirtualMethodsInImplementation {
 // Stubs to fill in the abstract method
 class ConcreteVirtualMethodsInHeaders : public VirtualMethodsInHeaders {
  public:
-  virtual void MethodIsAbstract() {}
+  virtual void MethodIsAbstract() override {}
 };
 
 class ConcreteVirtualMethodsInImplementation
     : public VirtualMethodsInImplementation {
  public:
-  virtual void MethodIsAbstract() {}
+  virtual void MethodIsAbstract() override {}
 };
 
 // Fill in the implementations