Move chrome.fileSystem implementation to //extensions

chrome/browser/extensions/api/file_system/file_system_api_unittest.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 "chrome/browser/extensions/api/file_system/file_system_api.h"
+#include "extensions/browser/api/file_system/file_system_api.h"
 
 #include <stddef.h>
 
 #include <vector>
 
 #include "base/files/file_path.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/shell_dialogs/select_file_dialog.h"
 
+// Tests static helper methods of chrome.fileSystem API functions.
+
 using extensions::FileSystemChooseEntryFunction;
 using extensions::api::file_system::AcceptOption;
 
 namespace extensions {
 namespace {
 
 void CheckExtensions(const std::vector<base::FilePath::StringType>& expected,
                      const std::vector<base::FilePath::StringType>& actual) {
   EXPECT_EQ(expected.size(), actual.size());
   if (expected.size() != actual.size())
@@ skipping 152 matching lines @@
   opt_name = std::string("/");
   FileSystemChooseEntryFunction::BuildSuggestion(&opt_name, &suggested_name,
       &suggested_extension);
   EXPECT_FALSE(suggested_name.IsAbsolute());
   EXPECT_TRUE(suggested_name.MaybeAsASCII().empty());
   EXPECT_TRUE(suggested_extension.empty());
 #endif
 }
 
 }  // namespace extensions