base::Bind: Cleanup almost-unused OldCompletionCallbacks.

net/disk_cache/disk_cache.h

Index: net/disk_cache/disk_cache.h
diff --git a/net/disk_cache/disk_cache.h b/net/disk_cache/disk_cache.h
index 3f52e23b6bb33cc3924f82edf4f97070392f242f..a678eecea41f8cb49fd0476cb0246010abdf85a8 100644
--- a/net/disk_cache/disk_cache.h
+++ b/net/disk_cache/disk_cache.h
@@ -97,7 +97,6 @@ class NET_EXPORT Backend {
   // Marks all entries for deletion. The return value is a net error code. If
   // this method returns ERR_IO_PENDING, the |callback| will be invoked when the
   // operation completes.
-  virtual int DoomAllEntries(OldCompletionCallback* callback) = 0;
   virtual int DoomAllEntries(const net::CompletionCallback& callback) = 0;
 
   // Marks a range of entries for deletion. This supports unbounded deletes in
@@ -106,9 +105,6 @@ class NET_EXPORT Backend {
   // |callback| will be invoked when the operation completes.
   virtual int DoomEntriesBetween(const base::Time initial_time,
                                  const base::Time end_time,
-                                 OldCompletionCallback* callback) = 0;
-  virtual int DoomEntriesBetween(const base::Time initial_time,
-                                 const base::Time end_time,
                                  const net::CompletionCallback& callback) = 0;
 
   // Marks all entries accessed since |initial_time| for deletion. The return
@@ -130,8 +126,6 @@ class NET_EXPORT Backend {
   // NOTE: This method does not modify the last_used field of the entry, and
   // therefore it does not impact the eviction ranking of the entry.
   virtual int OpenNextEntry(void** iter, Entry** next_entry,
-                            OldCompletionCallback* callback) = 0;
-  virtual int OpenNextEntry(void** iter, Entry** next_entry,
                             const net::CompletionCallback& callback) = 0;
 
   // Releases iter without returning the next entry. Whenever OpenNextEntry()