Bug 828594 - Follow-up: Remove import from AnnouncementsStartReceiver. r=trivial
Bug 799615 - Make Android Send Tab handle Twitter share intents.

This uses a new WebURLFinder class to extract URLs and find the "best"
URL to share.
Bug 799615 - Review comment: make WebURLFinder take a collection.
Bug 799615 - Make Android Send Tab handle Twitter share intents. r=rnewman