Remove unnecessary layout updates from InsertInto/DeleteFromTextNodeCommand

third_party/WebKit/Source/core/editing/commands/ReplaceSelectionCommand.cpp

Index: third_party/WebKit/Source/core/editing/commands/ReplaceSelectionCommand.cpp
diff --git a/third_party/WebKit/Source/core/editing/commands/ReplaceSelectionCommand.cpp b/third_party/WebKit/Source/core/editing/commands/ReplaceSelectionCommand.cpp
index 114e8543491a09cf284e8fc10fe4fc55a10228b0..be050c577b543684bebcf2db806d8497d7d3345c 100644
--- a/third_party/WebKit/Source/core/editing/commands/ReplaceSelectionCommand.cpp
+++ b/third_party/WebKit/Source/core/editing/commands/ReplaceSelectionCommand.cpp
@@ -950,7 +950,11 @@ void ReplaceSelectionCommand::mergeEndIfNeeded(EditingState* editingState) {
                      editingState);
     if (editingState->isAborted())
       return;
+
+    // TODO(editing-dev): Use of updateStyleAndLayoutIgnorePendingStylesheets()
+    // needs to be audited.  See http://crbug.com/590369 for more details.
     document().updateStyleAndLayoutIgnorePendingStylesheets();
+
     destination = VisiblePosition::beforeNode(placeholder);
     startOfParagraphToMove =
         createVisiblePosition(startOfParagraphToMove.toPositionWithAffinity());
@@ -1988,6 +1992,8 @@ bool ReplaceSelectionCommand::performTrivialReplace(
   if (end.isNull())
     return false;
 
+  document().updateStyleAndLayoutIgnorePendingStylesheets();
+
   if (nodeAfterInsertionPos && nodeAfterInsertionPos->parentNode() &&
       isHTMLBRElement(*nodeAfterInsertionPos) &&
       shouldRemoveEndBR(toHTMLBRElement(nodeAfterInsertionPos),