Update stale links to dvcs.w3.org

third_party/WebKit/Source/core/frame/Settings.in

 # Defines properties which are available on the Settings object.
 #
 # Please think carefully before adding a new Setting.  Some questions to
 # consider are:
 # - Should this be a RuntimeEnabledFeature instead? Settings are for things
 #   which we support either values of at runtime.  Features are set at renderer
 #   process startup and are never changed. Features also tend to be set to a
 #   value based on the platform or the stability of the code in question, where
 #   as settings both codepaths need to be stable.
 # - How will you ensure test coverage of all relevant values of your setting?
@@ skipping 266 matching lines @@
 
 # Forces initialization of main world, even if no scripts will be executed.
 # Used by inspector to report all contexts.
 forceMainWorldInitialization initial=false, invalidate=DOMWorlds
 
 # Compensates for poor text legibility on mobile devices. This value is
 # multiplied by the font scale factor when performing text autosizing of
 # websites that do not set an explicit viewport description.
 deviceScaleAdjustment type=double, initial=1.0, invalidate=TextAutosizing
 
-# This value indicates the maximum number of bytes a document is allowed
-# to transmit in Beacons (via navigator.sendBeacon()) -- Beacons are
-# intended to be smaller payloads transmitted as a page is unloading, not
-# a general (one-way) network transmission API.
-# The spec ( https://dvcs.w3.org/hg/webperf/raw-file/tip/specs/Beacon/Overview.html )
-# does not proscribe an upper limit, but allows for it -- the underlying
-# API will return 'false' in that case.
+# This value indicates the maximum number of bytes a document is allowed to
+# transmit in Beacons (via navigator.sendBeacon()) -- Beacons are intended to be
+# smaller payloads transmitted as a page is unloading, not a general (one-way)
+# network transmission API. The spec <https://w3c.github.io/beacon/> does not
+# proscribe an upper limit, but allows for it -- the underlying API will return
+# 'false' in that case.
 maxBeaconTransmission type=int, initial=65536
 
 # This value is set to false if the platform does not support fullscreen.
 # When set to false all the requests to enter fullscreen will return an error
 # (fullscreenerror or webkitfullscreenerror) as specified in the standard:
 # http://fullscreen.spec.whatwg.org/#dom-element-requestfullscreen
 fullscreenSupported initial=true
 
 # V8 supports different types of caching. Used by V8 bindings.
 v8CacheOptions type=V8CacheOptions, initial=V8CacheOptionsDefault
@@ skipping 124 matching lines @@
 
 # Whether download UI should be hidden for the current page content.
 hideDownloadUI initial=false
 
 # Whether or not to issue range requests for images and show placeholders.
 fetchImagePlaceholders initial=false
 
 # Whether the frame is a presentation receiver and should expose
 # `navigator.presentation.receiver`.
 presentationReceiver initial=false