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

chrome/browser/chromeos/extensions/echo_private_apitest.cc

Index: chrome/browser/chromeos/extensions/echo_private_apitest.cc
diff --git a/chrome/browser/chromeos/extensions/echo_private_apitest.cc b/chrome/browser/chromeos/extensions/echo_private_apitest.cc
index ceeae51210201a12e530f57083ad230c19d21663..5ef718eb571e689c410245b245abd871d6064cbb 100644
--- a/chrome/browser/chromeos/extensions/echo_private_apitest.cc
+++ b/chrome/browser/chromeos/extensions/echo_private_apitest.cc
@@ -48,7 +48,7 @@ class ExtensionEchoPrivateApiTest : public ExtensionApiTest {
             &ExtensionEchoPrivateApiTest::OnDialogShown, this)));
     function->set_has_callback(true);
 
-    scoped_ptr<base::Value> result(utils::RunFunctionAndReturnSingleResult(
+    std::unique_ptr<base::Value> result(utils::RunFunctionAndReturnSingleResult(
         function.get(),
         "[{\"serviceName\":\"some_name\",\"origin\":\"http://chromium.org\"}]",
         browser()));