Add a receiver interface to RemovableStorageNotifications.

chrome/browser/system_monitor/test_removable_storage_notifications.cc

Index: chrome/browser/system_monitor/test_removable_storage_notifications.cc
diff --git a/chrome/browser/system_monitor/test_removable_storage_notifications.cc b/chrome/browser/system_monitor/test_removable_storage_notifications.cc
index 56d4f41dd332dba816f7f50623053ad0d865d16e..0cc99416b6185570b83af1739b5856c79e192344 100644
--- a/chrome/browser/system_monitor/test_removable_storage_notifications.cc
+++ b/chrome/browser/system_monitor/test_removable_storage_notifications.cc
@@ -32,5 +32,16 @@ bool TestRemovableStorageNotifications::GetMTPStorageInfoFromDeviceId(
 }
 #endif
 
+void TestRemovableStorageNotifications::ProcessAttach(
+    const std::string& id,
+    const string16& name,
+    const FilePath::StringType& location) {
+  receiver_->ProcessAttach(StorageInfo(id, name, location));
+}
+
+void TestRemovableStorageNotifications::ProcessDetach(const std::string& id) {
+  receiver_->ProcessDetach(id);
+}
+
 }  // namespace test
 }  // namespace chrome