Remove frame flattening support as Chromium has no intention of using it

Source/core/rendering/RenderFrameBase.cpp

-/*
- * Copyright (C) 2010 Apple Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
- */
-
-#include "config.h"
-#include "RenderFrameBase.h"
-
-#include "Frame.h"
-#include "FrameView.h"
-#include "HTMLFrameElementBase.h"
-#include "RenderView.h"
-
-namespace WebCore {
-    
-RenderFrameBase::RenderFrameBase(Element* element)
-    : RenderPart(element)
-{
-}
-
-inline bool shouldExpandFrame(LayoutUnit width, LayoutUnit height, bool hasFixedWidth, bool hasFixedHeight)
-{
-    // If the size computed to zero never expand.
-    if (!width || !height)
-        return false;
-    // Really small fixed size frames can't be meant to be scrolled and are there probably by mistake. Avoid expanding.
-    static unsigned smallestUsefullyScrollableDimension = 8;
-    if (hasFixedWidth && width < LayoutUnit(smallestUsefullyScrollableDimension))
-        return false;
-    if (hasFixedHeight && height < LayoutUnit(smallestUsefullyScrollableDimension))
-        return false;
-    return true;
-}
-
-void RenderFrameBase::layoutWithFlattening(bool hasFixedWidth, bool hasFixedHeight)
-{
-    FrameView* childFrameView = toFrameView(widget());
-    RenderView* childRoot = childFrameView ? childFrameView->frame()->contentRenderer() : 0;
-
-    if (!childRoot || !shouldExpandFrame(width(), height(), hasFixedWidth, hasFixedHeight)) {
-        updateWidgetPosition();
-        if (childFrameView)
-            childFrameView->layout();
-        setNeedsLayout(false);
-        return;
-    }
-
-    // need to update to calculate min/max correctly
-    updateWidgetPosition();
-
-    // if scrollbars are off, and the width or height are fixed
-    // we obey them and do not expand. With frame flattening
-    // no subframe much ever become scrollable.
-
-    HTMLFrameElementBase* element = static_cast<HTMLFrameElementBase*>(node());
-    bool isScrollable = element->scrollingMode() != ScrollbarAlwaysOff;
-
-    // consider iframe inset border
-    int hBorder = borderLeft() + borderRight();
-    int vBorder = borderTop() + borderBottom();
-
-    // make sure minimum preferred width is enforced
-    if (isScrollable || !hasFixedWidth) {
-        setWidth(max(width(), childRoot->minPreferredLogicalWidth() + hBorder));
-        // update again to pass the new width to the child frame
-        updateWidgetPosition();
-        childFrameView->layout();
-    }
-
-    // expand the frame by setting frame height = content height
-    if (isScrollable || !hasFixedHeight || childRoot->isFrameSet())
-        setHeight(max<LayoutUnit>(height(), childFrameView->contentsHeight() + vBorder));
-    if (isScrollable || !hasFixedWidth || childRoot->isFrameSet())
-        setWidth(max<LayoutUnit>(width(), childFrameView->contentsWidth() + hBorder));
-
-    updateWidgetPosition();
-
-    ASSERT(!childFrameView->layoutPending());
-    ASSERT(!childRoot->needsLayout());
-    ASSERT(!childRoot->firstChild() || !childRoot->firstChild()->firstChild() || !childRoot->firstChild()->firstChild()->needsLayout());
-
-    setNeedsLayout(false);
-}
-
-}