Simplify incremental paint invalidation

third_party/WebKit/Source/core/paint/SVGModelObjectPaintInvalidator.cpp

-// 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.
-
-#include "core/paint/SVGModelObjectPaintInvalidator.h"
-
-#include "core/layout/svg/LayoutSVGModelObject.h"
-#include "core/paint/ObjectPaintInvalidator.h"
-
-namespace blink {
-
-PaintInvalidationReason
-SVGModelObjectPaintInvalidator::invalidatePaintIfNeeded() {
-  ObjectPaintInvalidatorWithContext objectPaintInvalidator(m_object, m_context);
-  PaintInvalidationReason reason =
-      objectPaintInvalidator.computePaintInvalidationReason();
-
-  // Disable incremental invalidation for SVG objects to prevent under-
-  // invalidation. Unlike boxes, it is non-trivial (and rare) for SVG objects
-  // to be able to be incrementally invalidated (e.g., on height changes).
-  if (reason == PaintInvalidationIncremental &&
-      m_context.oldBounds != m_context.newBounds)
-    reason = PaintInvalidationFull;
-
-  return objectPaintInvalidator.invalidatePaintIfNeededWithComputedReason(
-      reason);
-}
-
-}  // namespace blink