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

chrome/browser/chromeos/mobile/mobile_activator_unittest.cc

Index: chrome/browser/chromeos/mobile/mobile_activator_unittest.cc
diff --git a/chrome/browser/chromeos/mobile/mobile_activator_unittest.cc b/chrome/browser/chromeos/mobile/mobile_activator_unittest.cc
index 5205b4b6ba34c1b0720db5e8af2ee78bd8cae8c8..2fda6d3d7a1742ce92100e79d278232571b11c25 100644
--- a/chrome/browser/chromeos/mobile/mobile_activator_unittest.cc
+++ b/chrome/browser/chromeos/mobile/mobile_activator_unittest.cc
@@ -290,7 +290,7 @@ void FakeRequestCellularActivationFailure(
     const NetworkState* network,
     const base::Closure& success_callback,
     const network_handler::ErrorCallback& error_callback) {
-  scoped_ptr<base::DictionaryValue> value;
+  std::unique_ptr<base::DictionaryValue> value;
   error_callback.Run("", std::move(value));
 }