Made return types of various Value::DeepCopy() implementations more specific

chrome/browser/extensions/extension_prefs.cc

 // Copyright (c) 2010 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/browser/extensions/extension_prefs.h"
 
 #include "base/string_util.h"
 #include "base/string_number_conversions.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/extensions/extension_pref_store.h"
@@ skipping 221 matching lines @@
 
     DCHECK(!FilePath(path_string).IsAbsolute());
     extension_dict->SetString(
         kPrefPath, install_directory_.Append(path_string).value());
   }
 }
 
 DictionaryValue* ExtensionPrefs::CopyCurrentExtensions() {
   const DictionaryValue* extensions = prefs_->GetDictionary(kExtensionsPref);
   if (extensions) {
-    DictionaryValue* copy =
-        static_cast<DictionaryValue*>(extensions->DeepCopy());
+    DictionaryValue* copy = extensions->DeepCopy();
     MakePathsAbsolute(copy);
     return copy;
   }
   return new DictionaryValue;
 }
 
 bool ExtensionPrefs::ReadBooleanFromPref(
     DictionaryValue* ext, const std::string& pref_key) {
   bool bool_value = false;
   if (!ext->GetBoolean(pref_key, &bool_value))
@@ skipping 1047 matching lines @@
 void ExtensionPrefs::RegisterUserPrefs(PrefService* prefs) {
   prefs->RegisterDictionaryPref(kExtensionsPref);
   prefs->RegisterListPref(kExtensionToolbar);
   prefs->RegisterIntegerPref(prefs::kExtensionToolbarSize, -1);
   prefs->RegisterDictionaryPref(kExtensionsBlacklistUpdate);
   prefs->RegisterListPref(prefs::kExtensionInstallAllowList);
   prefs->RegisterListPref(prefs::kExtensionInstallDenyList);
   prefs->RegisterListPref(prefs::kExtensionInstallForceList);
   prefs->RegisterStringPref(kWebStoreLogin, std::string() /* default_value */);
 }