Move the corresponding cc files from content\test to be alongside their headers in content\public\t…

content/test/mock_download_item.cc

Index: content/test/mock_download_item.cc
===================================================================
--- content/test/mock_download_item.cc	(revision 151499)
+++ content/test/mock_download_item.cc	(working copy)
@@ -1,12 +0,0 @@
-// 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 "content/public/test/mock_download_item.h"
-
-namespace content {
-
-MockDownloadItem::MockDownloadItem() {}
-MockDownloadItem::~MockDownloadItem() {}
-
-}