Merge "Make DynamicPred...Base extend ExpandableBinaryDictionary."

...android/inputmethod/latin/ExpandableBinaryDictionary.java

...c/com/android/inputmethod/latin/ExpandableDictionary.java

java/src/com/android/inputmethod/latin/LatinIME.java

...rsonalization/DynamicPersonalizationDictionaryWriter.java

...atin/personalization/DynamicPredictionDictionaryBase.java

...utmethod/latin/personalization/PersonalizationHelper.java

.../personalization/PersonalizationPredictionDictionary.java

...atin/personalization/UserHistoryDictionaryBigramList.java

...atin/personalization/UserHistoryPredictionDictionary.java

.../android/inputmethod/latin/ExpandableDictionaryTests.java

...hod/latin/personalization/UserHistoryDictionaryTests.java