Move FS related mojo methods to ArcFileSystemInstance.

chrome/browser/chromeos/arc/fileapi/arc_content_file_system_async_file_util_unittest.cc

Index: chrome/browser/chromeos/arc/fileapi/arc_content_file_system_async_file_util_unittest.cc
diff --git a/chrome/browser/chromeos/arc/fileapi/arc_content_file_system_async_file_util_unittest.cc b/chrome/browser/chromeos/arc/fileapi/arc_content_file_system_async_file_util_unittest.cc
index 92e03a3a928fd269981d1ffa59872415daa35dc4..a1f61fb15d53bc1da4b0cff19a027770208eaff4 100644
--- a/chrome/browser/chromeos/arc/fileapi/arc_content_file_system_async_file_util_unittest.cc
+++ b/chrome/browser/chromeos/arc/fileapi/arc_content_file_system_async_file_util_unittest.cc
@@ -26,8 +26,9 @@ constexpr int64_t kSize = 123456;
 
 class ArcIntentHelperInstanceTestImpl : public FakeIntentHelperInstance {
  public:
-  void GetFileSize(const std::string& url,
-                   const GetFileSizeCallback& callback) override {
+  void GetFileSizeDeprecated(
+      const std::string& url,
+      const GetFileSizeDeprecatedCallback& callback) override {
     EXPECT_EQ(kArcUrl, url);
     base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE,
                                                   base::Bind(callback, kSize));