Fix narrow child cluster inherit multiplier from wide parent cluster

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

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 1137 matching lines @@
     return true;
 
   const LayoutBlock* parent_deepest_block_containing_all_text =
       DeepestBlockContainingAllText(cluster->parent_);
 #if DCHECK_IS_ON()
   DCHECK(blocks_that_have_begun_layout_.Contains(cluster->root_));
   DCHECK(blocks_that_have_begun_layout_.Contains(
       parent_deepest_block_containing_all_text));
 #endif
 
-  float content_width = cluster->root_->ContentLogicalWidth().ToFloat();
+  float content_width =
+      DeepestBlockContainingAllText(cluster)->ContentLogicalWidth().ToFloat();
   float cluster_text_width =
       parent_deepest_block_containing_all_text->ContentLogicalWidth().ToFloat();
 
   // Clusters with a root that is wider than the deepestBlockContainingAllText
   // of their parent autosize independently of their parent.
   if (content_width > cluster_text_width)
     return true;
 
   // Clusters with a root that is significantly narrower than the
   // deepestBlockContainingAllText of their parent autosize independently of
@@ skipping 218 matching lines @@
     }
   }
   potentially_inconsistent_superclusters.clear();
 }
 
 DEFINE_TRACE(TextAutosizer) {
   visitor->Trace(document_);
 }
 
 }  // namespace blink