Fixed spell check failing to change word.

 Bug 5387838
 On WebView.rebuildWebTextView, setTextAndKeepSelection was
 being called, erasing the selections. Changed it so that
 when text is replaced with the exact same value, no replace
 is done. Also, on the Google search, when a spelling change
 was made, the final character was placed improperly. When
 a single character is added, the javascript events for the
 character are sent. When multiple characters are changed,
 the entire value is replaced with no javascript key events
 sent.

Change-Id: I791eeb3c96354cfe3cbfda7e8d05c81fcdeb152f