Revert "Update tools, platform-tools and SDK to 17"

This reverts commit ce24ca647c8086cf677b93d0c97c682b9137650b

We're not ready to roll yet to 17 and we need changes to the NDK
6931 files changed
tree: f0290e89edec55d3f365fedc24c18a4560d0a565
  1. ndk/
  2. sdk/
  3. android_tools.gyp
  4. LICENSE
  5. README.chromium