Backed out 2 changesets (bug 1674234) for SM bustages on PreXULSkeletonUI.cpp . CLOSED TREE

Backed out changeset 093306c14ca2 (bug 1674234)
Backed out changeset 2684003a37f9 (bug 1674234)

browser/components/BrowserContentHandler.jsm

@@ -301,11 +301,9 @@ function openBrowserWindow(
         ).usePrivateBrowsing = true;
       }
 
-      let openTime = win.openTime;
       win.location = chromeURL;
       win.arguments = args; // <-- needs to be a plain JS array here.
 
-      ChromeUtils.addProfilerMarker("earlyBlankWindowVisible", openTime);
       return win;
     }
   }

browser/components/BrowserGlue.jsm

@@ -700,7 +700,6 @@ let JSWINDOWACTORS = {
 };
 
 (function earlyBlankFirstPaint() {
-  let startTime = Cu.now();
   if (
     AppConstants.platform == "macosx" ||
     !Services.prefs.getBoolPref("browser.startup.blankWindow", false)
@@ -782,9 +781,6 @@ let JSWINDOWACTORS = {
   // The window becomes visible after OnStopRequest, so make this happen now.
   win.stop();
 
-  ChromeUtils.addProfilerMarker("earlyBlankFirstPaint", startTime);
-  win.openTime = Cu.now();
-
   let { TelemetryTimestamps } = ChromeUtils.import(
     "resource://gre/modules/TelemetryTimestamps.jsm"
   );

mozglue/misc/PreXULSkeletonUI.cpp

@@ -13,7 +13,6 @@
 #include "mozilla/Assertions.h"
 #include "mozilla/Attributes.h"
 #include "mozilla/glue/Debug.h"
-#include "mozilla/BaseProfilerMarkers.h"
 #include "mozilla/UniquePtr.h"
 #include "mozilla/Vector.h"
 #include "mozilla/WindowsDpiAwareness.h"
@@ -722,8 +721,6 @@ bool LoadGdi32AndUser32Procedures() {
 }
 
 void CreateAndStorePreXULSkeletonUI(HINSTANCE hInstance) {
-  const TimeStamp skeletonStart = TimeStamp::NowUnfuzzed();
-
   HKEY regKey;
   if (!IsWin10OrLater() || !OpenPreXULSkeletonUIRegKey(regKey)) {
     return;
@@ -890,10 +887,6 @@ void CreateAndStorePreXULSkeletonUI(HINSTANCE hInstance) {
     sPreXULSKeletonUIAnimationThread = ::CreateThread(
         nullptr, 256 * 1024, AnimateSkeletonUI, nullptr, 0, nullptr);
   }
-
-  BASE_PROFILER_MARKER_UNTYPED(
-      "CreatePreXULSkeletonUI", OTHER,
-      MarkerTiming::IntervalUntilNowFrom(skeletonStart));
 }
 
 bool WasPreXULSkeletonUIMaximized() { return sMaximized; }