Move some fileapi tests next to the files they cover.

storage/browser/fileapi/file_system_usage_cache_unittest.cc

 // Copyright 2014 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 "storage/browser/fileapi/file_system_usage_cache.h"
 
 #include <stdint.h>
 
 #include <limits>
 
@@ skipping 143 matching lines @@
   base::FilePath usage_file_path = GetUsageFilePath();
   EXPECT_FALSE(usage_cache()->IncrementDirty(usage_file_path));
 }
 
 TEST_F(FileSystemUsageCacheTest, DecrementDirtyWithoutCacheFileTest) {
   base::FilePath usage_file_path = GetUsageFilePath();
   EXPECT_FALSE(usage_cache()->IncrementDirty(usage_file_path));
 }
 
 }  // namespace content