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

chrome/browser/chromeos/login/lock/screen_locker_tester.cc

Index: chrome/browser/chromeos/login/lock/screen_locker_tester.cc
diff --git a/chrome/browser/chromeos/login/lock/screen_locker_tester.cc b/chrome/browser/chromeos/login/lock/screen_locker_tester.cc
index 23a6a19491755e73769b9f7f25715d66a098c19d..081e5bf174e2edcb573be46551d0fde1446dcea4 100644
--- a/chrome/browser/chromeos/login/lock/screen_locker_tester.cc
+++ b/chrome/browser/chromeos/login/lock/screen_locker_tester.cc
@@ -127,7 +127,7 @@ void WebUIScreenLockerTester::SetPassword(const std::string& password) {
 
 std::string WebUIScreenLockerTester::GetPassword() {
   std::string result;
-  scoped_ptr<base::Value> v = content::ExecuteScriptAndGetValue(
+  std::unique_ptr<base::Value> v = content::ExecuteScriptAndGetValue(
       RenderViewHost()->GetMainFrame(),
       "$('pod-row').pods[0].passwordElement.value;");
   CHECK(v->GetAsString(&result));
@@ -142,7 +142,7 @@ void WebUIScreenLockerTester::EnterPassword(const std::string& password) {
   ASSERT_EQ(password, GetPassword());
 
   // Verify that "reauth" warning is hidden.
-  scoped_ptr<base::Value> v = content::ExecuteScriptAndGetValue(
+  std::unique_ptr<base::Value> v = content::ExecuteScriptAndGetValue(
       RenderViewHost()->GetMainFrame(),
       "window.getComputedStyle("
       "    $('pod-row').pods[0].querySelector('.reauth-hint-container'))"