Cheer up spell-checking code

chrome/browser/spellchecker/misspelling.cc

 // Copyright (c) 2013 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.
 //
 // The |Misspelling| object stores the misspelling, a spellcheck suggestion for
 // it, and user's action on it. The misspelling is stored as |context|,
 // |location|, and |length| instead of only misspelled text, because the
 // spellcheck algorithm uses the context.
 
 #include "chrome/browser/spellchecker/misspelling.h"
@@ skipping 30 matching lines @@
                          uint32_t hash)
     : context(context),
       location(location),
       length(length),
       suggestions(suggestions),
       hash(hash),
       timestamp(base::Time::Now()) {}
 
 Misspelling::~Misspelling() {}
 
-base::DictionaryValue* SerializeMisspelling(const Misspelling& misspelling) {
-  base::DictionaryValue* result = new base::DictionaryValue;
+scoped_ptr<base::DictionaryValue> SerializeMisspelling(
+    const Misspelling& misspelling) {
+  scoped_ptr<base::DictionaryValue> result(new base::DictionaryValue);
   result->SetString(
       "timestamp",
       base::Int64ToString(static_cast<long>(misspelling.timestamp.ToJsTime())));
   result->SetInteger("misspelledLength", misspelling.length);
   result->SetInteger("misspelledStart", misspelling.location);
   result->SetString("originalText", misspelling.context);
   result->SetString("suggestionId", base::UintToString(misspelling.hash));
   result->Set("suggestions", BuildSuggestionsValue(misspelling.suggestions));
   result->Set("userActions", BuildUserActionValue(misspelling.action));
   return result;
 }
 
 base::string16 GetMisspelledString(const Misspelling& misspelling) {
   // Feedback sender does not create Misspelling objects for spellcheck results
   // that are out-of-bounds of checked text length.
   if (misspelling.location > misspelling.context.length())
     return base::string16();
   return misspelling.context.substr(misspelling.location, misspelling.length);
 }
 
 size_t ApproximateSerializedSize(const Misspelling& misspelling) {
   // Estimated by eyeballing JSON overhead.
   const size_t kNumberOfOverheadBytes = 180;
   size_t result = misspelling.context.length() + kNumberOfOverheadBytes;
   for (const base::string16& suggestion : misspelling.suggestions)
     result += suggestion.size();
   return result;
 }