Patch 2: Added a preprocessor flag for platform spellcheck.

chrome/renderer/spellchecker/spellcheck.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/renderer/spellchecker/spellcheck.h"
 
 #include <algorithm>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
@@ skipping 368 matching lines @@
 void SpellCheck::PostDelayedSpellCheckTask(SpellcheckRequest* request) {
   if (!request)
     return;
 
   base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE, base::Bind(&SpellCheck::PerformSpellCheck, AsWeakPtr(),
                             base::Owned(request)));
 }
 #endif
 
-#if !defined(OS_MACOSX)  // Mac uses its native engine instead.
+#if !defined(OS_MACOSX)  // Mac uses its platform engine instead.
 void SpellCheck::PerformSpellCheck(SpellcheckRequest* param) {
   DCHECK(param);
 
   if (!spellcheck_.IsEnabled()) {
     param->completion()->didCancelCheckingText();
   } else {
     WebVector<blink::WebTextCheckingResult> results;
     SpellCheckParagraph(param->text(), &results);
     param->completion()->didFinishCheckingText(results);
   }
@@ skipping 50 matching lines @@
     }
 
     results.push_back(WebTextCheckingResult(
         static_cast<WebTextDecorationType>(decoration),
         line_offset + spellcheck_result.location, spellcheck_result.length,
         replacement, spellcheck_result.hash));
   }
 
   textcheck_results->assign(results);
 }