Get rid of false assert from CompositeEditCommand::moveParagraphContentsToNewBlockIfNecessary

Source/core/editing/CompositeEditCommand.cpp

Index: Source/core/editing/CompositeEditCommand.cpp
diff --git a/Source/core/editing/CompositeEditCommand.cpp b/Source/core/editing/CompositeEditCommand.cpp
index 4b4dfce54b63bb7350b7c9efdf6bafc534c7dd98..c24a3aab0a3d9ccd7cfebe87668b4cb960e09a82 100644
--- a/Source/core/editing/CompositeEditCommand.cpp
+++ b/Source/core/editing/CompositeEditCommand.cpp
@@ -923,9 +923,8 @@ PassRefPtr<Node> CompositeEditCommand::moveParagraphContentsToNewBlockIfNecessar
                 return nullptr;
             }
         } else if (enclosingBlock(upstreamEnd.deprecatedNode()) != upstreamStart.deprecatedNode()) {
-            // The visibleEnd.  It must be an ancestor of the paragraph start.
+            // It should be an ancestor of the paragraph start.
             // We can bail as we have a full block to work with.
-            ASSERT(upstreamStart.deprecatedNode()->isDescendantOf(enclosingBlock(upstreamEnd.deprecatedNode())));
             return nullptr;
         } else if (isEndOfEditableOrNonEditableContent(visibleEnd)) {
             // At the end of the editable region. We can bail here as well.