Convert //chrome from scoped_ptr to std::unique_ptr

chrome/service/service_process_prefs_unittest.cc

Index: chrome/service/service_process_prefs_unittest.cc
diff --git a/chrome/service/service_process_prefs_unittest.cc b/chrome/service/service_process_prefs_unittest.cc
index ed5ad046c419d6aa655898baa1e736cb98fd83b9..494b8bf3ed20c1843d3c83f5995afe2453c2bbfe 100644
--- a/chrome/service/service_process_prefs_unittest.cc
+++ b/chrome/service/service_process_prefs_unittest.cc
@@ -27,7 +27,7 @@ class ServiceProcessPrefsTest : public testing::Test {
   base::ScopedTempDir temp_dir_;
   // A message loop that we can use as the file thread message loop.
   base::MessageLoop message_loop_;
-  scoped_ptr<ServiceProcessPrefs> prefs_;
+  std::unique_ptr<ServiceProcessPrefs> prefs_;
 };
 
 // Test ability to retrieve prefs