Remove RenderFlowThread::offsetFromLogicalTopOfFirstRegion().

Source/core/rendering/RenderFlowThread.cpp

Index: Source/core/rendering/RenderFlowThread.cpp
diff --git a/Source/core/rendering/RenderFlowThread.cpp b/Source/core/rendering/RenderFlowThread.cpp
index 135898888342c96cc059f9e504071659114b317d..e6722af12e76cee2bc858512659672b7c0e57af4 100644
--- a/Source/core/rendering/RenderFlowThread.cpp
+++ b/Source/core/rendering/RenderFlowThread.cpp
@@ -220,107 +220,6 @@ LayoutRect RenderFlowThread::fragmentsBoundingBox(const LayoutRect& layerBoundin
     return result;
 }
 
-bool RenderFlowThread::cachedOffsetFromLogicalTopOfFirstRegion(const RenderBox* box, LayoutUnit& result) const
-{
-    RenderBoxToOffsetMap::const_iterator offsetIterator = m_boxesToOffsetMap.find(box);
-    if (offsetIterator == m_boxesToOffsetMap.end())
-        return false;
-
-    result = offsetIterator->value;
-    return true;
-}
-
-void RenderFlowThread::setOffsetFromLogicalTopOfFirstRegion(const RenderBox* box, LayoutUnit offset)
-{
-    m_boxesToOffsetMap.set(box, offset);
-}
-
-void RenderFlowThread::clearOffsetFromLogicalTopOfFirstRegion(const RenderBox* box)
-{
-    ASSERT(m_boxesToOffsetMap.contains(box));
-    m_boxesToOffsetMap.remove(box);
-}
-
-const RenderBox* RenderFlowThread::currentStatePusherRenderBox() const
-{
-    const RenderObject* currentObject = m_statePusherObjectsStack.isEmpty() ? 0 : m_statePusherObjectsStack.last();
-    if (currentObject && currentObject->isBox())
-        return toRenderBox(currentObject);
-
-    return 0;
-}
-
-void RenderFlowThread::pushFlowThreadLayoutState(const RenderObject& object)
-{
-    if (const RenderBox* currentBoxDescendant = currentStatePusherRenderBox()) {
-        LayoutState* layoutState = currentBoxDescendant->view()->layoutState();
-        if (layoutState && layoutState->isPaginated()) {
-            ASSERT(layoutState->renderer() == currentBoxDescendant);
-            LayoutSize offsetDelta = layoutState->layoutOffset() - layoutState->pageOffset();
-            setOffsetFromLogicalTopOfFirstRegion(currentBoxDescendant, currentBoxDescendant->isHorizontalWritingMode() ? offsetDelta.height() : offsetDelta.width());
-        }
-    }
-
-    ASSERT(!m_statePusherObjectsStack.contains(&object));
-    m_statePusherObjectsStack.add(&object);
-}
-
-void RenderFlowThread::popFlowThreadLayoutState()
-{
-    m_statePusherObjectsStack.removeLast();
-
-    if (const RenderBox* currentBoxDescendant = currentStatePusherRenderBox()) {
-        LayoutState* layoutState = currentBoxDescendant->view()->layoutState();
-        if (layoutState && layoutState->isPaginated())
-            clearOffsetFromLogicalTopOfFirstRegion(currentBoxDescendant);
-    }
-}
-
-LayoutUnit RenderFlowThread::offsetFromLogicalTopOfFirstRegion(const RenderBlock* currentBlock) const
-{
-    // First check if we cached the offset for the block if it's an ancestor containing block of the box
-    // being currently laid out.
-    LayoutUnit offset;
-    if (cachedOffsetFromLogicalTopOfFirstRegion(currentBlock, offset))
-        return offset;
-
-    // If it's the current box being laid out, use the layout state.
-    const RenderBox* currentBoxDescendant = currentStatePusherRenderBox();
-    if (currentBlock == currentBoxDescendant) {
-        LayoutState* layoutState = view()->layoutState();
-        ASSERT(layoutState->renderer() == currentBlock);
-        ASSERT(layoutState && layoutState->isPaginated());
-        LayoutSize offsetDelta = layoutState->layoutOffset() - layoutState->pageOffset();
-        return currentBoxDescendant->isHorizontalWritingMode() ? offsetDelta.height() : offsetDelta.width();
-    }
-
-    // As a last resort, take the slow path.
-    LayoutRect blockRect(0, 0, currentBlock->width(), currentBlock->height());
-    while (currentBlock && !currentBlock->isRenderFlowThread()) {
-        RenderBlock* containerBlock = currentBlock->containingBlock();
-        ASSERT(containerBlock);
-        if (!containerBlock)
-            return 0;
-        LayoutPoint currentBlockLocation = currentBlock->location();
-
-        if (containerBlock->style()->writingMode() != currentBlock->style()->writingMode()) {
-            // We have to put the block rect in container coordinates
-            // and we have to take into account both the container and current block flipping modes
-            if (containerBlock->style()->isFlippedBlocksWritingMode()) {
-                if (containerBlock->isHorizontalWritingMode())
-                    blockRect.setY(currentBlock->height() - blockRect.maxY());
-                else
-                    blockRect.setX(currentBlock->width() - blockRect.maxX());
-            }
-            currentBlock->flipForWritingMode(blockRect);
-        }
-        blockRect.moveBy(currentBlockLocation);
-        currentBlock = containerBlock;
-    }
-
-    return currentBlock->isHorizontalWritingMode() ? blockRect.y() : blockRect.x();
-}
-
 void RenderFlowThread::RegionSearchAdapter::collectIfNeeded(const MultiColumnSetInterval& interval)
 {
     if (m_result)