Remove a bunch of stuff in //mojo

components/filesystem/files_test_base.h

Index: components/filesystem/files_test_base.h
diff --git a/components/filesystem/files_test_base.h b/components/filesystem/files_test_base.h
index 57b13d88f2f1834059ee4a9456b81d034cc7a951..80fc63314486c30b31e4b855d6f41c89bf6d6b0f 100644
--- a/components/filesystem/files_test_base.h
+++ b/components/filesystem/files_test_base.h
@@ -12,6 +12,28 @@
 
 namespace filesystem {
 
+template <typename T1>
+mojo::Callback<void(T1)> Capture(T1* t1) {
+  return [t1](T1 got_t1) { *t1 = std::move(got_t1); };
+}
+
+template <typename T1, typename T2>
+mojo::Callback<void(T1, T2)> Capture(T1* t1, T2* t2) {
+  return [t1, t2](T1 got_t1, T2 got_t2) {
+    *t1 = std::move(got_t1);
+    *t2 = std::move(got_t2);
+  };
+}
+
+template <typename T1, typename T2, typename T3>
+mojo::Callback<void(T1, T2, T3)> Capture(T1* t1, T2* t2, T3* t3) {
+  return [t1, t2, t3](T1 got_t1, T2 got_t2, T3 got_t3) {
+    *t1 = std::move(got_t1);
+    *t2 = std::move(got_t2);
+    *t3 = std::move(got_t3);
+  };
+}
+
 class FilesTestBase : public shell::test::ShellTest {
  public:
   FilesTestBase();