Disk cache: Avoid restarting the cache while it may be in use....

net/disk_cache/backend_impl.h

Index: net/disk_cache/backend_impl.h
===================================================================
--- net/disk_cache/backend_impl.h	(revision 21362)
+++ net/disk_cache/backend_impl.h	(working copy)
@@ -35,13 +35,15 @@
       : path_(path), block_files_(path), mask_(0), max_size_(0),
         cache_type_(net::DISK_CACHE), uma_report_(0), user_flags_(0),
         init_(false), restarted_(false), unit_test_(false), read_only_(false),
-        new_eviction_(false), first_timer_(true) {}
+        new_eviction_(false), first_timer_(true),
+        ALLOW_THIS_IN_INITIALIZER_LIST(factory_(this)) {}
   // mask can be used to limit the usable size of the hash table, for testing.
   BackendImpl(const std::wstring& path, uint32 mask)
       : path_(path), block_files_(path), mask_(mask), max_size_(0),
         cache_type_(net::DISK_CACHE), uma_report_(0), user_flags_(kMask),
         init_(false), restarted_(false), unit_test_(false), read_only_(false),
-        new_eviction_(false), first_timer_(true) {}
+        new_eviction_(false), first_timer_(true),
+        ALLOW_THIS_IN_INITIALIZER_LIST(factory_(this)) {}
   ~BackendImpl();
 
   // Performs general initialization for this current instance of the cache.
@@ -272,6 +274,7 @@
   Stats stats_;  // Usage statistcs.
   base::RepeatingTimer<BackendImpl> timer_;  // Usage timer.
   scoped_refptr<TraceObject> trace_object_;  // Inits internal tracing.
+  ScopedRunnableMethodFactory<BackendImpl> factory_;
 
   DISALLOW_EVIL_CONSTRUCTORS(BackendImpl);
 };