Enable AzimuthAltitude flag for all Blink configurations

Intent to Ship link:
https://groups.google.com/a/chromium.org/forum/?utm_medium=email&utm_source=footer#!msg/blink-dev/ZRI-7X_4GwM/Sp1ZMIw5AgAJ

Bug: 1069500
Change-Id: I01630006c2eebb1fdb0b09a08af59cf230ed33f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2343385Reviewed-by: Mustaq Ahmed <mustaq@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Commit-Queue: Liviu Tinta <liviutinta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796952}

third_party/blink/renderer/platform/runtime_enabled_features.json5

@@ -218,7 +218,7 @@
     },
     {
       name: "AzimuthAltitude",
-      status: "experimental",
+      status: "stable",
     },
     {
       name: "BackForwardCache",

third_party/blink/web_tests/virtual/stable/webexposed/global-interface-listing-expected.txt

@@ -5147,6 +5147,8 @@ interface PluginArray
     method refresh
 interface PointerEvent : MouseEvent
     attribute @@toStringTag
+    getter altitudeAngle
+    getter azimuthAngle
     getter height
     getter isPrimary
     getter pointerId