Change raw pointer mNamedReaders to reference

Using a reference for mNamedReaders ensures it is never updated.

Also:
 - add FIXME related to lack of lock protection for mNamedReaders.
 - add a few other FIXME
 - add section breaks

Bug: 37153050
Test: builds OK
Change-Id: I8b80acb5cc943795becdc2d24debc11b09620753
diff --git a/services/medialog/MediaLogService.h b/services/medialog/MediaLogService.h
index e9211b4..39d9cc0 100644
--- a/services/medialog/MediaLogService.h
+++ b/services/medialog/MediaLogService.h
@@ -56,6 +56,8 @@
     Mutex               mLock;
 
     Vector<NBLog::NamedReader> mNamedReaders;   // protected by mLock
+
+    // FIXME Need comments on all of these, especially about locking
     NBLog::Shared *mMergerShared;
     NBLog::Merger mMerger;
     NBLog::MergeReader mMergeReader;