Switch base::Value typemapping to be by value instead of by unique_ptr.

extensions/browser/sandboxed_unpacker.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 "extensions/browser/sandboxed_unpacker.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <set>
@@ skipping 408 matching lines @@
 
   DCHECK(directory.DirName() == temp_dir_.GetPath());
 
   utility_process_mojo_client_->service()->Unpack(
       directory, extension_id_, location_, creation_flags_,
       base::Bind(&SandboxedUnpacker::UnpackDone, this));
 }
 
 void SandboxedUnpacker::UnpackDone(
     const base::string16& error,
-    std::unique_ptr<base::DictionaryValue> manifest) {
+    const base::Optional<base::DictionaryValue>& manifest) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   utility_process_mojo_client_.reset();
 
   if (!error.empty()) {
     unpacker_io_task_runner_->PostTask(
         FROM_HERE,
         base::Bind(&SandboxedUnpacker::UnpackExtensionFailed, this, error));
     return;
   }
 
   unpacker_io_task_runner_->PostTask(
       FROM_HERE, base::Bind(&SandboxedUnpacker::UnpackExtensionSucceeded, this,
-                            base::Passed(&manifest)));
+                            base::Passed(manifest->CreateDeepCopy())));
 }
 
 void SandboxedUnpacker::UnpackExtensionSucceeded(
     std::unique_ptr<base::DictionaryValue> manifest) {
   CHECK(unpacker_io_task_runner_->RunsTasksOnCurrentThread());
 
   std::unique_ptr<base::DictionaryValue> final_manifest(
       RewriteManifestFile(*manifest));
   if (!final_manifest)
     return;
@@ skipping 450 matching lines @@
 
 void SandboxedUnpacker::Cleanup() {
   DCHECK(unpacker_io_task_runner_->RunsTasksOnCurrentThread());
   if (!temp_dir_.Delete()) {
     LOG(WARNING) << "Can not delete temp directory at "
                  << temp_dir_.GetPath().value();
   }
 }
 
 }  // namespace extensions