Fix for double header and footer on ndk download pages: b/27950742...

Fix for double header and footer on ndk download pages: b/27950742 https://android-dot-devsite.googleplex.com/ndk/downloads/index.html am: 01febb96 am: 9ba538ee am: 6e666024 am: bfe88888
am: 9d307e42

* commit '9d307e42':
  Fix for double header and footer on ndk download pages: b/27950742 https://android-dot-devsite.googleplex.com/ndk/downloads/index.html

Change-Id: I8bd829a8780c803e2da4504f0321e232e8538dad