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

chrome/browser/extensions/api/declarative/declarative_apitest.cc

Index: chrome/browser/extensions/api/declarative/declarative_apitest.cc
diff --git a/chrome/browser/extensions/api/declarative/declarative_apitest.cc b/chrome/browser/extensions/api/declarative/declarative_apitest.cc
index c64f21b445d4418970d0cd1765e2aeb25a230ffb..810b4df4f03966127551183fe79ad685a7ac8ec8 100644
--- a/chrome/browser/extensions/api/declarative/declarative_apitest.cc
+++ b/chrome/browser/extensions/api/declarative/declarative_apitest.cc
@@ -4,10 +4,11 @@
 
 #include <stddef.h>
 
+#include <memory>
+
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/test/thread_test_helper.h"