am 007ad770: merge from open-source master

Merge commit '007ad770' into kraken

* commit '007ad770':
  Adapt to new location of libcore
  Parse custom text header and ignore it.
  Parse "multipart/vnd.wap.multipart.alternative" which is a part of multipart body (nested multipart).
  'uses-library' was not working for persistent applications.
  Fix an NPE in InputMethodService when mExtractAction is null.