System server should always send broadcasts to a specific or all users

Bug: 7368245

Log a warning if the system process calls unqualified sendBroadcast()
and other calls.

As a result of the logging above, found a few more method calls such as
bindService() that would benefit from being more explicit to avoid
future confusion and reduce the log warnings.

Change-Id: I17f15c8be9adf7becd456d6abbab606f19befdbf
diff --git a/services/java/com/android/server/BackupManagerService.java b/services/java/com/android/server/BackupManagerService.java
index f241c80..dcbf3f5 100644
--- a/services/java/com/android/server/BackupManagerService.java
+++ b/services/java/com/android/server/BackupManagerService.java
@@ -836,7 +836,8 @@
             if ((info.flags & ApplicationInfo.FLAG_SYSTEM) != 0) {
                 if (DEBUG) Slog.v(TAG, "Binding to Google transport");
                 Intent intent = new Intent().setComponent(transportComponent);
-                context.bindService(intent, mGoogleConnection, Context.BIND_AUTO_CREATE);
+                context.bindService(intent, mGoogleConnection, Context.BIND_AUTO_CREATE,
+                        UserHandle.USER_OWNER);
             } else {
                 Slog.w(TAG, "Possible Google transport spoof: ignoring " + info);
             }