Remove setErrorMessageCallback from WebGraphicsContext3D.

third_party/WebKit/public/platform/callback/WebClosure.h

-// Copyright 2016 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 WebClosure_h
-#define WebClosure_h
-
-#include "base/bind.h"
-#include "base/callback.h"
-#include "base/callback_helpers.h"
-#include "base/macros.h"
-#include "base/memory/ptr_util.h"
-#include "public/platform/WebCommon.h"
-
-#include <memory>
-#include <utility>
-
-#if BLINK_IMPLEMENTATION
-#include "wtf/Functional.h"
-#else
-#include "base/logging.h"
-#endif
-
-namespace blink {
-
-// Conversion from WTF closures to base closures to pass a callback out of
-// blink.
-class WebClosure {
-public:
-#if BLINK_IMPLEMENTATION
-    WebClosure() {}
-
-    explicit WebClosure(PassOwnPtr<SameThreadClosure> c)
-    {
-        m_closure = base::Bind(&RunAndDelete, base::Passed(base::WrapUnique(c.leakPtr())));
-    }
-#endif
-
-    // TODO(danakj): These could be =default with MSVC 2015.
-    WebClosure(WebClosure&& other) { *this = std::move(other); }
-    WebClosure& operator=(WebClosure&& other)
-    {
-#if DCHECK_IS_ON()
-        m_haveClosure = other.m_haveClosure;
-        other.m_haveClosure = false;
-#endif
-        m_closure = std::move(other.m_closure);
-        return *this;
-    }
-
-#if !BLINK_IMPLEMENTATION
-    // TODO(danakj): This could be rvalue-ref-qualified.
-    base::Closure TakeBaseClosure()
-    {
-#if DCHECK_IS_ON()
-        // Don't call this more than once!
-        DCHECK(m_haveClosure);
-        m_haveClosure = false;
-#endif
-        return std::move(m_closure);
-    }
-#endif
-
-private:
-#if BLINK_IMPLEMENTATION
-    static void RunAndDelete(std::unique_ptr<SameThreadClosure> c) { (*c)(); }
-#endif
-
-#if DCHECK_IS_ON()
-    bool m_haveClosure = true;
-#endif
-    base::Closure m_closure;
-
-    DISALLOW_COPY_AND_ASSIGN(WebClosure);
-};
-
-} // namespace blink
-
-#endif // WebClosure_h