Use lock-free lazy initialization for static histogram references

net/disk_cache/stats.h

Index: net/disk_cache/stats.h
===================================================================
--- net/disk_cache/stats.h	(revision 79771)
+++ net/disk_cache/stats.h	(working copy)
@@ -86,7 +86,7 @@
   uint32 storage_addr_;
   int data_sizes_[kDataSizesLength];
   int64 counters_[MAX_COUNTER];
-  scoped_refptr<StatsHistogram> size_histogram_;
+  StatsHistogram* size_histogram_;

[rvargas (doing something else), 2011/04/01 19:20:52]

Can we have a scoped_ptr instead?. Probably not... never mind then.

[jar (doing other things), 2011/04/01 21:50:27]

Since we're deliberately leaking all of these, we don't want to delete, since
others are depending on the eternally correct raw pointer (to memory that will
be leaked).

 
   DISALLOW_COPY_AND_ASSIGN(Stats);
 };