Remove partial blockfile v3 disk_cache implementation.

net/disk_cache/blockfile/backend_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/disk_cache/blockfile/backend_impl.h"
 
 #include <limits>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 1523 matching lines @@
   if (it != open_entries_.end()) {
     // Easy job. This entry is already in memory.
     EntryImpl* this_entry = it->second;
     this_entry->AddRef();
     *entry = this_entry;
     return 0;
   }
 
   STRESS_DCHECK(block_files_.IsValid(address));
 
-  if (!address.SanityCheckForEntryV2()) {
+  if (!address.SanityCheckForEntry()) {
     LOG(WARNING) << "Wrong entry address.";
     STRESS_NOTREACHED();
     return ERR_INVALID_ADDRESS;
   }
 
   scoped_refptr<EntryImpl> cache_entry(
       new EntryImpl(this, address, read_only_));
   IncreaseNumRefs();
   *entry = NULL;
 
@@ skipping 555 matching lines @@
     if (total_memory > kMaxBuffersSize || total_memory <= 0)
       total_memory = kMaxBuffersSize;
 
     done = true;
   }
 
   return static_cast<int>(total_memory);
 }
 
 }  // namespace disk_cache