Fix the process header for system server strict mode dropbox entries.

Should be system_server instead of unknown.

Change-Id: Ib4005252dc99180fc54b3fc63b06ca3e17ee230a
diff --git a/services/core/java/com/android/server/am/ActivityManagerService.java b/services/core/java/com/android/server/am/ActivityManagerService.java
index 26bcb98..132d6a9 100644
--- a/services/core/java/com/android/server/am/ActivityManagerService.java
+++ b/services/core/java/com/android/server/am/ActivityManagerService.java
@@ -9013,7 +9013,9 @@
         final boolean isSystemApp = process == null ||
                 (process.info.flags & (ApplicationInfo.FLAG_SYSTEM |
                                        ApplicationInfo.FLAG_UPDATED_SYSTEM_APP)) != 0;
-        final String processName = process == null ? "unknown" : process.processName;
+        final String processName = process != null && process.getPid() == MY_PID
+                ? "system_server"
+                : (process == null ? "unknown" : process.processName);
         final DropBoxManager dbox = (DropBoxManager)
                 mContext.getSystemService(Context.DROPBOX_SERVICE);