Have ce's ctrl+arrow functionality use UnicodeJS library

Change 57076 implemented the functionality required to skip
words in UnicodeJS. This change simply removes all the existing
code we had and replaces it with this implementation.

Bug: 46794
Change-Id: I6b2700d65476c4d34ba4a01a88382d7af8e736fb
Merge "Have ce's ctrl+arrow functionality use UnicodeJS library"