Convert a few components from scoped_ptr to std::unique_ptr

components/storage_monitor/storage_monitor.cc

Index: components/storage_monitor/storage_monitor.cc
diff --git a/components/storage_monitor/storage_monitor.cc b/components/storage_monitor/storage_monitor.cc
index e571dd2088124c4172fc335f6de191921cd45a44..6f2b23ccaceb3c50c723479236b17435acab4c65 100644
--- a/components/storage_monitor/storage_monitor.cc
+++ b/components/storage_monitor/storage_monitor.cc
@@ -66,7 +66,7 @@ StorageMonitor* StorageMonitor::GetInstance() {
 }
 
 void StorageMonitor::SetStorageMonitorForTesting(
-    scoped_ptr<StorageMonitor> storage_monitor) {
+    std::unique_ptr<StorageMonitor> storage_monitor) {
   delete g_storage_monitor;
   g_storage_monitor = storage_monitor.release();
 }