Clean up dependencies for disk_cache histogram_macros.h.

net/disk_cache/v3/backend_impl_v3.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/v3/backend_impl_v3.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
@@ skipping 12 matching lines @@
 #include "net/base/net_errors.h"
 #include "net/disk_cache/cache_util.h"
 #include "net/disk_cache/errors.h"
 #include "net/disk_cache/experiments.h"
 #include "net/disk_cache/file.h"
 #include "net/disk_cache/storage_block-inl.h"
 #include "net/disk_cache/v3/disk_format_v3.h"
 #include "net/disk_cache/v3/entry_impl_v3.h"
 #include "net/disk_cache/v3/index_table.h"
 
-// This has to be defined before including histogram_macros.h from this file.
-#define NET_DISK_CACHE_BACKEND_IMPL_CC_
+// Define BLOCKFILE_BACKEND_IMPL_OBJ to be a disk_cache::BackendImpl* in order
+// to use the CACHE_UMA histogram macro.
+#define BLOCKFILE_BACKEND_IMPL_OBJ this
 #include "net/disk_cache/v3/histogram_macros.h"
 
 using base::Time;
 using base::TimeDelta;
 using base::TimeTicks;
 
 namespace {
 
 #if defined(V3_NOT_JUST_YET_READY)
 const int kDefaultCacheSize = 80 * 1024 * 1024;
@@ skipping 1553 matching lines @@
 }
 
 void BackendImplV3::OnExternalCacheHit(const std::string& key) {
   NOTIMPLEMENTED();
 }
 
 void BackendImplV3::CleanupCache() {
 }
 
 }  // namespace disk_cache