Make LoadLog refcounted-thread safe....

net/base/load_log.h

Index: net/base/load_log.h
===================================================================
--- net/base/load_log.h	(revision 30488)
+++ net/base/load_log.h	(working copy)
@@ -14,7 +14,10 @@
 
 // LoadLog stores profiling information on where time was spent while servicing
 // a request (waiting in queues, resolving hosts, resolving proxy, etc...).
-class LoadLog : public base::RefCounted<LoadLog> {
+//
+// Note that LoadLog is NOT THREADSAFE, however it is RefCountedThreadSafe so
+// that it can be AddRef() / Release() across threads.
+class LoadLog : public base::RefCountedThreadSafe<LoadLog> {
  public:
 
   enum EventType {