Bug 1598424 - Co-located EME prefs (prefixed media.eme) to improve code structure. r=bryce

The four prefs moved in this revision were relocated to single a location with other EME related prefs. Grouping like prefs improves the code structure.

Differential Revision: https://phabricator.services.mozilla.com/D55388

--HG--
extra : moz-landing-system : lando

modules/libpref/init/StaticPrefList.yaml

@@ -5838,6 +5838,27 @@
   value: false
   mirror: always
 
+- name: media.eme.audio.blank
+  type: RelaxedAtomicBool
+  value: false
+  mirror: always
+
+- name: media.eme.video.blank
+  type: RelaxedAtomicBool
+  value: false
+  mirror: always
+
+- name: media.eme.chromium-api.video-shmems
+  type: RelaxedAtomicUint32
+  value: 6
+  mirror: always
+
+# Is support for MediaKeys.getStatusForPolicy enabled?
+- name: media.eme.hdcp-policy-check.enabled
+  type: bool
+  value: false
+  mirror: always
+
 - name: media.clearkey.persistent-license.enabled
   type: bool
   value: false
@@ -6093,20 +6114,6 @@
   value: false
   mirror: always
 
-- name: media.eme.audio.blank
-  type: RelaxedAtomicBool
-  value: false
-  mirror: always
-- name: media.eme.video.blank
-  type: RelaxedAtomicBool
-  value: false
-  mirror: always
-
-- name: media.eme.chromium-api.video-shmems
-  type: RelaxedAtomicUint32
-  value: 6
-  mirror: always
-
 # Whether to suspend decoding of videos in background tabs.
 - name: media.suspend-bkgnd-video.enabled
   type: RelaxedAtomicBool
@@ -6471,12 +6478,6 @@
   value: @IS_NIGHTLY_BUILD@
   mirror: always
 
-# Is support for MediaKeys.getStatusForPolicy enabled?
-- name: media.eme.hdcp-policy-check.enabled
-  type: bool
-  value: false
-  mirror: always
-
 # Is support for MediaDevices.ondevicechange enabled?
 - name: media.ondevicechange.enabled
   type: bool