Convert //chrome/browser/extensions from scoped_ptr to std::unique_ptr

chrome/browser/extensions/api/preference/preference_apitest.cc

Index: chrome/browser/extensions/api/preference/preference_apitest.cc
diff --git a/chrome/browser/extensions/api/preference/preference_apitest.cc b/chrome/browser/extensions/api/preference/preference_apitest.cc
index f6e7e40c537e82963a5b97e85264072b647316cd..97f5299f2db910f0904690f895e5572180b631f0 100644
--- a/chrome/browser/extensions/api/preference/preference_apitest.cc
+++ b/chrome/browser/extensions/api/preference/preference_apitest.cc
@@ -2,9 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <memory>
+
 #include "base/bind_helpers.h"
 #include "base/location.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/thread_task_runner_handle.h"
@@ -94,7 +95,7 @@ class ExtensionPreferenceApiTest : public ExtensionApiTest {
     // BrowserProcess::Shutdown() needs to be called in a message loop, so we
     // post a task to release the keep alive, then run the message loop.
     base::ThreadTaskRunnerHandle::Get()->PostTask(
-        FROM_HERE, base::Bind(&scoped_ptr<ScopedKeepAlive>::reset,
+        FROM_HERE, base::Bind(&std::unique_ptr<ScopedKeepAlive>::reset,
                               base::Unretained(&keep_alive_), nullptr));
     content::RunAllPendingInMessageLoop();
 
@@ -102,7 +103,7 @@ class ExtensionPreferenceApiTest : public ExtensionApiTest {
   }
 
   Profile* profile_;
-  scoped_ptr<ScopedKeepAlive> keep_alive_;
+  std::unique_ptr<ScopedKeepAlive> keep_alive_;
 };
 
 // http://crbug.com/177163