Update plugin to handle new style rules for virtual annotations.

tools/clang/plugins/tests/virtual_bodies.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef VIRTUAL_METHODS_H_
 #define VIRTUAL_METHODS_H_
 
 // Should warn about virtual method usage.
 class VirtualMethodsInHeaders {
  public:
@@ skipping 14 matching lines @@
 
 // Don't complain about things in a 'testing' namespace.
 namespace testing {
 struct TestStruct {};
 }  // namespace testing
 
 class VirtualMethodsInHeadersTesting : public VirtualMethodsInHeaders {
  public:
   // Don't complain about no virtual testing methods.
   void MethodHasNoArguments();
+
  private:
   testing::TestStruct tester_;
 };
 
 #endif  // VIRTUAL_METHODS_H_