Convert //extensions/{common,shell} from scoped_ptr to std::unique_ptr

extensions/shell/browser/shell_prefs_unittest.cc

Index: extensions/shell/browser/shell_prefs_unittest.cc
diff --git a/extensions/shell/browser/shell_prefs_unittest.cc b/extensions/shell/browser/shell_prefs_unittest.cc
index 3f91f171a5042bdc6b3c547d4e442a2ee8a8f8cd..a2fbe3a1d0f39891605dae0fe0304ced605af485 100644
--- a/extensions/shell/browser/shell_prefs_unittest.cc
+++ b/extensions/shell/browser/shell_prefs_unittest.cc
@@ -45,7 +45,7 @@ class ShellPrefsTest : public testing::Test {
 };
 
 TEST_F(ShellPrefsTest, CreateLocalState) {
-  scoped_ptr<PrefService> local_state =
+  std::unique_ptr<PrefService> local_state =
       shell_prefs::CreateLocalState(browser_context_.GetPath());
   ASSERT_TRUE(local_state);
 
@@ -60,7 +60,7 @@ TEST_F(ShellPrefsTest, CreateLocalState) {
 
 TEST_F(ShellPrefsTest, CreateUserPrefService) {
   // Create the pref service. This loads the test pref file.
-  scoped_ptr<PrefService> service =
+  std::unique_ptr<PrefService> service =
       shell_prefs::CreateUserPrefService(&browser_context_);
 
   // Some basic extension preferences are registered.