Remove void** from disk_cache interface.

net/disk_cache/tracing/tracing_cache_backend.cc

Index: net/disk_cache/tracing/tracing_cache_backend.cc
diff --git a/net/disk_cache/tracing/tracing_cache_backend.cc b/net/disk_cache/tracing/tracing_cache_backend.cc
index 1efdb99963d3bfe13fdc4bba5471243a5a729c17..cdbdc9959a85ecc9a1ee702b15c6ab84a1df17c7 100644
--- a/net/disk_cache/tracing/tracing_cache_backend.cc
+++ b/net/disk_cache/tracing/tracing_cache_backend.cc
@@ -297,15 +297,11 @@ int TracingCacheBackend::DoomEntriesSince(base::Time initial_time,
   return backend_->DoomEntriesSince(initial_time, callback);
 }
 
-int TracingCacheBackend::OpenNextEntry(void** iter, Entry** next_entry,
+int TracingCacheBackend::OpenNextEntry(Iterator* iter, Entry** next_entry,
                                        const CompletionCallback& callback) {
   return backend_->OpenNextEntry(iter, next_entry, callback);
 }
 
-void TracingCacheBackend::EndEnumeration(void** iter) {
-  return backend_->EndEnumeration(iter);
-}
-
 void TracingCacheBackend::GetStats(StatsItems* stats) {
   return backend_->GetStats(stats);
 }