Convert the no-inline-virtuals rule into a constructors rule.

tools/clang/plugins/tests/virtual_bodies.cpp

 // Copyright (c) 2012 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.
 
 #include "virtual_bodies.h"
 
 // Shouldn't warn about method usage in the implementation file.
 class VirtualMethodsInImplementation {
  public:
-  virtual void MethodIsAbstract() = 0;
-  virtual void MethodHasNoArguments();
-  virtual void MethodHasEmptyDefaultImpl() {}
-  virtual bool ComplainAboutThis() { return true; }
+  // Complain about the inline/missing constructor.
+  virtual void Method1() {}
+  virtual bool Method2() { return true; }
+  virtual void Method3() {}
+  virtual bool Method4() { return true; }
+  virtual void Method5() {}
 };
-
-// Stubs to fill in the abstract method
-class ConcreteVirtualMethodsInHeaders : public VirtualMethodsInHeaders {
- public:
-  void MethodIsAbstract() override {}
-};
-
-class ConcreteVirtualMethodsInImplementation
-    : public VirtualMethodsInImplementation {
- public:
-  void MethodIsAbstract() override {}
-};
-
-// Fill in the implementations
-void VirtualMethodsInHeaders::MethodHasNoArguments() {
-}
-void WarnOnMissingVirtual::MethodHasNoArguments() {
-}
-void VirtualMethodsInImplementation::MethodHasNoArguments() {
-}
-
-int main() {
-  ConcreteVirtualMethodsInHeaders one;
-  ConcreteVirtualMethodsInImplementation two;
-}