Bug 1016949 - Add unit test for enabling/disabling suggested sites (r=mfinkle)
Bug 1009587 - Part 1: Store suggested sites in a Map instead of a List (r=mfinkle)
Bug 1009587 - Part 2: Add SuggestedSites API to get image URL and bg color (r=mfinkle)
Bug 1009587 - Part 3: Hold a strong reference to cached suggested sites (r=mfinkle)
Bug 1009587 - Part 4: Use suggested thumbnail on top sites whenever it's available (r=mfinkle)
Bug 1009587 - Part 5: Don't try to load thumbnails for blank urls (r=mfinkle)
Bug 1009587 - Part 6: Don't wait for thumbnails to show blank spots (r=mfinkle)