Merge 116325

Source/WebCore/rendering/RenderBlock.cpp

Index: Source/WebCore/rendering/RenderBlock.cpp
===================================================================
--- Source/WebCore/rendering/RenderBlock.cpp	(revision 118027)
+++ Source/WebCore/rendering/RenderBlock.cpp	(working copy)
@@ -5965,6 +5965,9 @@
             remainingText->setFirstLetter(newFirstLetter);
             toRenderBoxModelObject(newFirstLetter)->setFirstLetterRemainingText(remainingText);
         }
+        // To prevent removal of single anonymous block in RenderBlock::removeChild and causing
+        // |nextSibling| to go stale, we remove the old first letter using removeChildNode first.
+        firstLetterContainer->virtualChildren()->removeChildNode(firstLetterContainer, firstLetter);
         firstLetter->destroy();
         firstLetter = newFirstLetter;
         firstLetterContainer->addChild(firstLetter, nextSibling);