TextIteratorAlgorithm should not force layout update in constructor.

third_party/WebKit/Source/core/editing/spellcheck/TextCheckingHelper.cpp

 /*
  * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 232 matching lines @@
     , m_end(end)
 {
 }
 
 TextCheckingHelper::~TextCheckingHelper()
 {
 }
 
 String TextCheckingHelper::findFirstMisspelling(int& firstMisspellingOffset, bool markAll)
 {
+    // TODO(dglazkov): The use of updateLayoutIgnorePendingStylesheets needs to be audited.
+    // see http://crbug.com/590369 for more details.
+    m_start.document()->updateLayoutIgnorePendingStylesheets();
+
     WordAwareIterator it(m_start, m_end);
     firstMisspellingOffset = 0;
 
     String firstMisspelling;
     int currentChunkOffset = 0;
 
     while (!it.atEnd()) {
         int length = it.length();
 
         // Skip some work for one-space-char hunks
@@ skipping 319 matching lines @@
         return false;
 
     const Settings* settings = frame->settings();
     if (!settings)
         return false;
 
     return settings->unifiedTextCheckerEnabled();
 }
 
 } // namespace blink