Update stale links to dvcs.w3.org

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

Index: third_party/WebKit/Source/core/frame/Settings.in
diff --git a/third_party/WebKit/Source/core/frame/Settings.in b/third_party/WebKit/Source/core/frame/Settings.in
index 8251456dae3c40279f3638e62e49e380184046ff..312470fc9aa05d915e1a7dc53bbc3af268378e4d 100644
--- a/third_party/WebKit/Source/core/frame/Settings.in
+++ b/third_party/WebKit/Source/core/frame/Settings.in
@@ -284,13 +284,12 @@ forceMainWorldInitialization initial=false, invalidate=DOMWorlds
 # 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.