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

chrome/browser/extensions/api/browser/browser_apitest.cc

Index: chrome/browser/extensions/api/browser/browser_apitest.cc
diff --git a/chrome/browser/extensions/api/browser/browser_apitest.cc b/chrome/browser/extensions/api/browser/browser_apitest.cc
index eae51aa3f476d692ff06f164a0a275111354d650..d250398d16c9e25b4f34c62b5559fc367bfeb4b9 100644
--- a/chrome/browser/extensions/api/browser/browser_apitest.cc
+++ b/chrome/browser/extensions/api/browser/browser_apitest.cc
@@ -2,9 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <memory>
 #include <string>
 
-#include "base/memory/scoped_ptr.h"
 #include "base/strings/stringprintf.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/api/browser/browser_api.h"