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: db692be994a4fc468dc754b1d86be77b772d29d8
  1. dictionaries/
  2. java/
  3. native/
  4. tests/
  5. tools/
  6. Android.mk
  7. CleanSpec.mk