[Editing] Use VisiblePosition stardOfWord for textarea in spell checker.

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

 /*
  * Copyright (C) 2006, 2007, 2008, 2011 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 54 matching lines @@
   TextControlElement* textControl = enclosingTextControl(selectionStart);
   return isHTMLInputElement(textControl) &&
          toHTMLInputElement(textControl)->isTextField();
 }
 
 bool isPositionInTextArea(const Position& position) {
   TextControlElement* textControl = enclosingTextControl(position);
   return isHTMLTextAreaElement(textControl);
 }
 
-bool isSelectionInTextFormControl(const VisibleSelection& selection) {
-  return !!enclosingTextControl(selection.start());
-}
-
 static bool isSpellCheckingEnabledFor(const Position& position) {
   if (position.isNull())
     return false;
   // TODO(tkent): The following password type check should be done in
   // HTMLElement::spellcheck(). crbug.com/371567
   if (TextControlElement* textControl = enclosingTextControl(position)) {
     if (isHTMLInputElement(textControl) &&
         toHTMLInputElement(textControl)->type() == InputTypeNames::password)
       return false;
   }
@@ skipping 804 matching lines @@
   // needs to be audited.  See http://crbug.com/590369 for more details.
   // In the long term we should use idle time spell checker to prevent
   // synchronous layout caused by spell checking (see crbug.com/517298).
   frame().document()->updateStyleAndLayoutIgnorePendingStylesheets();
 
   DocumentLifecycle::DisallowTransitionScope disallowTransition(
       frame().document()->lifecycle());
 
   VisibleSelection newAdjacentWords;
   const VisibleSelection newSelection = frame().selection().selection();
-  if (isSelectionInTextFormControl(newSelection)) {
-    const Position newStart = newSelection.start();
-    newAdjacentWords.setWithoutValidation(
-        TextControlElement::startOfWord(newStart),
-        TextControlElement::endOfWord(newStart));
-  } else {
-    if (newSelection.isContentEditable()) {
-      newAdjacentWords =
-          createVisibleSelection(selectWord(newSelection.visibleStart()));
-    }
+  if (newSelection.isContentEditable()) {
+    newAdjacentWords =
+        createVisibleSelection(selectWord(newSelection.visibleStart()));
   }
 
   // When typing we check spelling elsewhere, so don't redo it here.
   // If this is a change in selection resulting from a delete operation,
   // oldSelection may no longer be in the document.
   // FIXME(http://crbug.com/382809): if oldSelection is on a textarea
   // element, we cause synchronous layout.
   spellCheckOldSelection(oldSelectionStart, newAdjacentWords);
 }
 
@@ skipping 242 matching lines @@
         startOfNextParagraph(createVisiblePosition(paragraphEnd));
     paragraphStart = newParagraphStart.toParentAnchoredPosition();
     paragraphEnd = endOfParagraph(newParagraphStart).toParentAnchoredPosition();
     firstIteration = false;
     totalLengthProcessed += currentLength;
   }
   return std::make_pair(firstFoundItem, firstFoundOffset);
 }
 
 }  // namespace blink