Remove void** from disk_cache interface.

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 4f64b9afb02ac4219532491f592d0c7b269985fb..4442e11908b2b04e384df66d4ed2d4e30c89b356 100644
--- a/net/disk_cache/disk_cache.h
+++ b/net/disk_cache/disk_cache.h
@@ -13,6 +13,7 @@
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "net/base/cache_type.h"
 #include "net/base/completion_callback.h"
@@ -64,13 +65,28 @@ class NET_EXPORT Backend {
  public:
   typedef net::CompletionCallback CompletionCallback;
 
+  class Iterator {
+   public:
+    virtual ~Iterator();
+
+    // OpenNextEntry returns |net::OK| and provides |next_entry| if there is an
+    // entry to enumerate. It returns |net::ERR_FAILED| at the end of
+    // enumeration. If any entry in the cache is modified during iteration, the
+    // result of this function is thereafter undefined.
+
+    // Some cache backends make stronger guarantees about mutation during
+    // iteration, see top comment in simple_backend_impl.h for details.
+    virtual int OpenNextEntry(Entry** next_entry,
+                              const CompletionCallback& callback) = 0;
+  };
+
   // If the backend is destroyed when there are operations in progress (any
   // callback that has not been invoked yet), this method cancels said
   // operations so the callbacks are not invoked, possibly leaving the work
   // half way (for instance, dooming just a few entries). Note that pending IO
   // for a given Entry (as opposed to the Backend) will still generate a
   // callback from within this method.
-  virtual ~Backend() {}
+  virtual ~Backend();
 
   // Returns the type of this cache.
   virtual net::CacheType GetCacheType() const = 0;
@@ -123,31 +139,9 @@ class NET_EXPORT Backend {
   virtual int DoomEntriesSince(base::Time initial_time,
                                const CompletionCallback& callback) = 0;
 
-  // Enumerates the cache. Initialize |iter| to NULL before calling this method
-  // the first time. That will cause the enumeration to start at the head of
-  // the cache. For subsequent calls, pass the same |iter| pointer again without
-  // changing its value. This method returns ERR_FAILED when there are no more
-  // entries to enumerate. When the entry pointer is no longer needed, its
-  // Close method should be called. The return value is a net error code. If
-  // this method returns ERR_IO_PENDING, the |callback| will be invoked when the
-  // |next_entry| is available. The pointer to receive the |next_entry| must
-  // remain valid until the operation completes.
-  //
-  // 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. However,
-  // an enumeration will go through all entries on the cache only if the cache
-  // is not modified while the enumeration is taking place. Significantly
-  // altering the entry pointed by |iter| (for example, deleting the entry) will
-  // invalidate |iter|. Performing operations on an entry that modify the entry
-  // may result in loops in the iteration, skipped entries or similar.
-  virtual int OpenNextEntry(void** iter, Entry** next_entry,
-                            const CompletionCallback& callback) = 0;
-
-  // Releases iter without returning the next entry. Whenever OpenNextEntry()
-  // returns true, but the caller is not interested in continuing the
-  // enumeration by calling OpenNextEntry() again, the enumeration must be
-  // ended by calling this method with iter returned by OpenNextEntry().
-  virtual void EndEnumeration(void** iter) = 0;
+  // Returns an iterator which will enumerate all entries of the cache in an
+  // undefined order.
+  virtual scoped_ptr<Iterator> CreateIterator() = 0;
 
   // Return a list of cache statistics.
   virtual void GetStats(
@@ -310,7 +304,7 @@ class NET_EXPORT Entry {
   virtual int ReadyForSparseIO(const CompletionCallback& callback) = 0;
 
  protected:
-  virtual ~Entry() {}
+  virtual ~Entry();
 };
 
 struct EntryDeleter {