Revert "Use PrevWordsInfo for get/add/remove n-gram(bigram) entry."

This reverts commit ff50b39176370ab80a33bfdcf9979603c08a88b3.

Bug: 14119293
Bug: 14425059
Bug: 15102610

Change-Id: If278b4ab236e38d20d8cdc0761b0438911bd4ff9
15 files changed
tree: be1cb07de81d88f6cb4e59a416816d19160cff0c
  1. dictionaries/
  2. java/
  3. native/
  4. tests/
  5. tools/
  6. Android.mk
  7. CleanSpec.mk