Remove strict-virtual-specifiers option, since it's enabled everywhere.

tools/clang/plugins/tests/overridden_methods.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 "overridden_methods.h"
 
 // Fill in the implementations
 void DerivedClass::SomeMethod() {}
 void DerivedClass::SomeOtherMethod() {}
 void DerivedClass::WebKitModifiedSomething() {}
 
 class ImplementationInterimClass : public BaseClass {
  public:
-  // Should not warn about pure virtual methods.
+  // Should warn about pure virtual methods.
   virtual void SomeMethod() = 0;
 };
 
 class ImplementationDerivedClass : public ImplementationInterimClass,
                                    public webkit_glue::WebKitObserverImpl {
  public:
-  // Should not warn about destructors.
+  // Should warn about destructors.
   virtual ~ImplementationDerivedClass() {}
   // Should warn.
   virtual void SomeMethod();
   // Should not warn if marked as override.
-  virtual void SomeOtherMethod() override;
+  void SomeOtherMethod() override;
   // Should not warn for inline implementations in implementation files.
   virtual void SomeInlineMethod() {}
   // Should not warn if overriding a method whose origin is blink.
   virtual void WebKitModifiedSomething();
   // Should warn with the insertion point after the const.
   virtual void SomeConstMethod() const {}
   // Should warn with the insertion point after the throw spec.
   virtual void SomeMethodWithExceptionSpec() throw() {}
   // Should warn with the insertion point after both the const and the throw
   // specifiers.
   virtual void SomeConstMethodWithExceptionSpec() const throw(int) {}
   // Should warn even if overridden method isn't pure.
   virtual void SomeNonPureBaseMethod() {}
   // Should warn and place correctly even when there is a comment.
   virtual void SomeMethodWithComment();  // This is a comment.
   // Should warn and place correctly even if there is a comment and body.
   virtual void SomeMethodWithCommentAndBody() {}  // This is a comment.
 };
 
 int main() {
   DerivedClass something;
   ImplementationDerivedClass something_else;
 }