Convert ARRAYSIZE_UNSAFE -> arraysize in base/.

R=thestig@chromium.org
BUG=423134

Review URL: https://codereview.chromium.org/656033009

Cr-Commit-Position: refs/heads/master@{#299835}
  void DidGetFileInfo(File::Error error,
                      const File::Info& file_info) {
    error_ = error;
    file_info_ = file_info;
    MessageLoop::current()->QuitWhenIdle();
  }

  void DidGetFileInfo(File::Error error,
                      const File::Info& file_info) {
    error_ = error;
    file_info_ = file_info;
    MessageLoop::current()->QuitWhenIdle();
  }
