Bug 511803 patch 1:  Fix serialization of font-variant-alternates values with more than one function.  (Tested in patch 2.)  r=jdaggett
Bug 511803 patch 2:  Convert all eCSSUnit_Function storage to use nsCSSKeyword.  This leads to one behavior change, which is case canonicalization for font-variant-alternates function values.  r=bzbarsky

--HG--
rename : layout/style/test/test_bug721136.html => layout/style/test/test_specified_value_serialization.html
Bug 870529 - JumpListStartup not being called on delay startup causing no shortcut maintenance. r=jimm
Bug 833385 - Implement HTMLTrackElement and TextTrack. r=bz,Ms2ger

Add webidl interfaces and implementations of the HTML <track>
element and related TextTrack, TextTrackList, TextTrackCue,
and TextTrackCueList dom objects.

Visibility is controlled by the media.webvtt.enabled pref,
which defaults to false.

HTMLMediaElement:NewURIFromString() is hoisted to
nsGenericHTMLElement so it's available to the track
element as well.

This patch is primarily work by Dale Karp, David Humphrey
and others as Seneca College.
Bug 872543 - Long-form data reporting notification sticks around after visiting settings. r=nalexander