[Runtime] Fix some coding style issues reported by lint.py.

```
runtime/app/android/xwalk_main_delegate_android.cc:60:  Lines should be <= 80
characters long  [whitespace/line_length] [2]
runtime/renderer/android/xwalk_render_view_ext.cc:37:  Lines should be <= 80
characters long  [whitespace/line_length] [2]
```