Bug 1768495 Part 3: Remove redundant pause-on-minimize in nsCocoaWindow, remove pref. r=gfx-reviewers,ahale

Differential Revision: https://phabricator.services.mozilla.com/D169346

modules/libpref/init/StaticPrefList.yaml

@@ -14949,12 +14949,6 @@
   value: true
   mirror: always
 
-# Whether to pause the compositor when a native window is minimized.
-- name: widget.pause-compositor-when-minimized
-  type: bool
-  value: true
-  mirror: always
-
 #ifdef MOZ_WAYLAND
 # Whether to override the DMABuf blocklist.
 - name: widget.dmabuf.force-enabled

widget/cocoa/nsCocoaWindow.mm

@@ -2109,10 +2109,6 @@ void nsCocoaWindow::DispatchSizeModeEvent() {
   if (mWidgetListener) {
     mWidgetListener->SizeModeChanged(newMode);
   }
-
-  if (StaticPrefs::widget_pause_compositor_when_minimized()) {
-    PauseOrResumeCompositor(newMode == nsSizeMode_Minimized);
-  }
 }
 
 void nsCocoaWindow::DispatchOcclusionEvent() {