Get rid of DISALLOW_EVIL_CONSTRUCTORS macro usage in our code base.

net/disk_cache/mem_backend_impl.h

Index: net/disk_cache/mem_backend_impl.h
diff --git a/net/disk_cache/mem_backend_impl.h b/net/disk_cache/mem_backend_impl.h
index 48d196cc31efa5d56c0f41ae0f3f1747176fdbac..e6874105aa3c5cb7d6e0e39e428e3ad06f7375ef 100644
--- a/net/disk_cache/mem_backend_impl.h
+++ b/net/disk_cache/mem_backend_impl.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 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.
 
@@ -94,7 +94,7 @@ class MemBackendImpl : public Backend {
   int32 max_size_;        // Maximum data size for this instance.
   int32 current_size_;
 
-  DISALLOW_EVIL_CONSTRUCTORS(MemBackendImpl);
+  DISALLOW_COPY_AND_ASSIGN(MemBackendImpl);
 };
 
 }  // namespace disk_cache