Remove void** from disk_cache interface.

net/disk_cache/simple/simple_backend_impl.cc

Index: net/disk_cache/simple/simple_backend_impl.cc
diff --git a/net/disk_cache/simple/simple_backend_impl.cc b/net/disk_cache/simple/simple_backend_impl.cc
index ffdc9b185b366ef95a2f1b6ca91a89714e6423f5..0d896114af0c7e99cecbf4c587c8ac9034f628c5 100644
--- a/net/disk_cache/simple/simple_backend_impl.cc
+++ b/net/disk_cache/simple/simple_backend_impl.cc
@@ -473,20 +473,13 @@ int SimpleBackendImpl::DoomEntriesSince(
   return DoomEntriesBetween(initial_time, Time(), callback);
 }
 
-int SimpleBackendImpl::OpenNextEntry(void** iter,
+int SimpleBackendImpl::OpenNextEntry(Iterator* iter,
                                      Entry** next_entry,
                                      const CompletionCallback& callback) {
-  CompletionCallback get_next_entry =
-      base::Bind(&SimpleBackendImpl::GetNextEntryInIterator, AsWeakPtr(), iter,
+  CompletionCallback open_next_entry_impl =
+      base::Bind(&SimpleBackendImpl::OpenNextEntryImpl, AsWeakPtr(), iter,
                  next_entry, callback);
-  return index_->ExecuteWhenReady(get_next_entry);
-}
-
-void SimpleBackendImpl::EndEnumeration(void** iter) {
-  SimpleIndex::HashList* entry_list =
-      static_cast<SimpleIndex::HashList*>(*iter);
-  delete entry_list;
-  *iter = NULL;
+  return index_->ExecuteWhenReady(open_next_entry_impl);
 }
 
 void SimpleBackendImpl::GetStats(
@@ -614,23 +607,35 @@ int SimpleBackendImpl::DoomEntryFromHash(uint64 entry_hash,
   return net::ERR_IO_PENDING;
 }
 
-void SimpleBackendImpl::GetNextEntryInIterator(
-    void** iter,
-    Entry** next_entry,
-    const CompletionCallback& callback,
-    int error_code) {
-  if (error_code != net::OK) {
-    callback.Run(error_code);
+void SimpleBackendImpl::OpenNextEntryImpl(Iterator* iter,
+                                          Entry** next_entry,
+                                          const CompletionCallback& callback,
+                                          int index_initialization_error_code) {
+  if (index_initialization_error_code != net::OK) {
+    callback.Run(index_initialization_error_code);
     return;
   }
-  if (*iter == NULL) {
-    *iter = index()->GetAllHashes().release();
-  }
-  SimpleIndex::HashList* entry_list =
-      static_cast<SimpleIndex::HashList*>(*iter);
-  while (entry_list->size() > 0) {
-    uint64 entry_hash = entry_list->back();
-    entry_list->pop_back();
+
+  class State : public EnumerationState {
+   public:
+    explicit State(scoped_ptr<std::vector<uint64> > hashes_to_enumerate) {
+      hashes_to_enumerate_.swap(*hashes_to_enumerate);
+    }
+    virtual ~State() {}
+
+    std::vector<uint64>& hashes_to_enumerate() { return hashes_to_enumerate_; }
+
+   private:
+    std::vector<uint64>  hashes_to_enumerate_;
+  };
+
+  if (!*iter)
+    iter->reset(new State(index()->GetAllHashes().Pass()));
+  State* state = static_cast<State*>(iter->get());
+
+  while (!state->hashes_to_enumerate().empty()) {
+    uint64 entry_hash = state->hashes_to_enumerate().back();
+    state->hashes_to_enumerate().pop_back();
     if (index()->Has(entry_hash)) {
       *next_entry = NULL;
       CompletionCallback continue_iteration = base::Bind(
@@ -707,7 +712,7 @@ void SimpleBackendImpl::OnEntryOpenedFromKey(
 }
 
 void SimpleBackendImpl::CheckIterationReturnValue(
-    void** iter,
+    Iterator* iter,
     Entry** entry,
     const CompletionCallback& callback,
     int error_code) {