Set date format when building default Gson to prevent crash
Set date format when building default Gson to prevent crash

I have not been able to reproduce this crash, but it seems Gson has a
problem parsing date strings when unmarshalling tab data.

From the info I've looked at online, explicitly defining a date format
will prevent ParseExceptions here:

https://stackoverflow.com/questions/7816586/gson-java-text-
parseexception-unparseable-date

https://stackoverflow.com/questions/33408620/java-gson-java-text-
parseexception-unparseable-date

Bug: T118575
Change-Id: I516e7352f4997703d250980b3e94e5aa88f7ad46

anirudh24seven/apps-android-wikipedia,Duct-and-rice/KrswtkhrWiki4Android,carloshwa/apps-android-wikipedia,Duct-and-rice/KrswtkhrWiki4Android,Duct-and-rice/KrswtkhrWiki4Android,SAGROUP2/apps-android-wikipedia,wikimedia/apps-android-wikipedia,carloshwa/apps-android-wikipedia,SAGROUP2/apps-android-wikipedia,anirudh24seven/apps-android-wikipedia,wikimedia/apps-android-wikipedia,SAGROUP2/apps-android-wikipedia,carloshwa/apps-android-wikipedia,carloshwa/apps-android-wikipedia,Duct-and-rice/KrswtkhrWiki4Android,dbrant/apps-android-wikipedia,SAGROUP2/apps-android-wikipedia,anirudh24seven/apps-android-wikipedia,Duct-and-rice/KrswtkhrWiki4Android,dbrant/apps-android-wikipedia,carloshwa/apps-android-wikipedia,SAGROUP2/apps-android-wikipedia,wikimedia/apps-android-wikipedia,dbrant/apps-android-wikipedia,anirudh24seven/apps-android-wikipedia,anirudh24seven/apps-android-wikipedia,dbrant/apps-android-wikipedia,dbrant/apps-android-wikipedia,wikimedia/apps-android-wikipedia