Move line/continuation specific parts of willBeDestroyed() into LayoutBlockFlow.

third_party/WebKit/Source/core/layout/LayoutBlock.cpp

Index: third_party/WebKit/Source/core/layout/LayoutBlock.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutBlock.cpp b/third_party/WebKit/Source/core/layout/LayoutBlock.cpp
index 862c3d8c5672d499912098c23b55bd2befce50c4..99c2ba7ddb76a7e110bcb004190419526a64f83a 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBlock.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutBlock.cpp
@@ -151,46 +151,8 @@ LayoutBlock::~LayoutBlock()
 
 void LayoutBlock::willBeDestroyed()
 {
-    // Mark as being destroyed to avoid trouble with merges in removeChild().
-    m_beingDestroyed = true;
-
-    // Make sure to destroy anonymous children first while they are still connected to the rest of the tree, so that they will
-    // properly dirty line boxes that they are removed from. Effects that do :before/:after only on hover could crash otherwise.
-    children()->destroyLeftoverChildren();
-
-    // Destroy our continuation before anything other than anonymous children.
-    // The reason we don't destroy it before anonymous children is that they may
-    // have continuations of their own that are anonymous children of our continuation.
-    LayoutBoxModelObject* continuation = this->continuation();
-    if (continuation) {
-        continuation->destroy();
-        setContinuation(nullptr);
-    }
-
-    if (!documentBeingDestroyed()) {
-        if (firstLineBox()) {
-            // We can't wait for LayoutBox::destroy to clear the selection,
-            // because by then we will have nuked the line boxes.
-            // FIXME: The FrameSelection should be responsible for this when it
-            // is notified of DOM mutations.
-            if (isSelectionBorder())
-                view()->clearSelection();
-
-            // If we are an anonymous block, then our line boxes might have children
-            // that will outlast this block. In the non-anonymous block case those
-            // children will be destroyed by the time we return from this function.
-            if (isAnonymousBlock()) {
-                for (InlineFlowBox* box = firstLineBox(); box; box = box->nextLineBox()) {
-                    while (InlineBox* childBox = box->firstChild())
-                        childBox->remove();
-                }
-            }
-        } else if (parent()) {
-            parent()->dirtyLinesFromChangedChild(this);
-        }
-    }
-
-    m_lineBoxes.deleteLineBoxes();
+    if (!documentBeingDestroyed() && parent())
+        parent()->dirtyLinesFromChangedChild(this);
 
     if (UNLIKELY(gDelayedUpdateScrollInfoSet != 0))
         gDelayedUpdateScrollInfoSet->remove(this);