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

chrome/browser/extensions/sandboxed_extension_unpacker.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/sandboxed_extension_unpacker.h"
 
 #include <set>
 
 #include "app/l10n_util.h"
 #include "base/base64.h"
@@ skipping 307 matching lines @@
   // Client takes ownership of temporary directory and extension.
   client_->OnUnpackSuccess(temp_dir_.Take(), extension_root_, extension_);
   extension_ = NULL;
 }
 
 DictionaryValue* SandboxedExtensionUnpacker::RewriteManifestFile(
     const DictionaryValue& manifest) {
   // Add the public key extracted earlier to the parsed manifest and overwrite
   // the original manifest. We do this to ensure the manifest doesn't contain an
   // exploitable bug that could be used to compromise the browser.
-  scoped_ptr<DictionaryValue> final_manifest(
-      static_cast<DictionaryValue*>(manifest.DeepCopy()));
+  scoped_ptr<DictionaryValue> final_manifest(manifest.DeepCopy());
   final_manifest->SetString(extension_manifest_keys::kPublicKey, public_key_);
 
   std::string manifest_json;
   JSONStringValueSerializer serializer(&manifest_json);
   serializer.set_pretty_print(true);
   if (!serializer.Serialize(*final_manifest)) {
     // Error serializing manifest.json.
     ReportFailure(l10n_util::GetStringFUTF8(
         IDS_EXTENSION_PACKAGE_INSTALL_ERROR,
         ASCIIToUTF16("ERROR_SERIALIZING_MANIFEST_JSON")));
@@ skipping 150 matching lines @@
       // Error saving catalog.
       ReportFailure(l10n_util::GetStringFUTF8(
           IDS_EXTENSION_PACKAGE_INSTALL_ERROR,
           ASCIIToUTF16("ERROR_SAVING_CATALOG")));
       return false;
     }
   }
 
   return true;
 }