Bug 1813407 [Linux] Remove unused nsWindow::GetMozContainerSize() r=emilio

Depends on D169907

Differential Revision: https://phabricator.services.mozilla.com/D169908

widget/gtk/nsWindow.cpp

@@ -9660,18 +9660,6 @@ void nsWindow::SetEGLNativeWindowSize(
 }
 #endif
 
-LayoutDeviceIntSize nsWindow::GetMozContainerSize() {
-  LayoutDeviceIntSize size(0, 0);
-  if (mContainer) {
-    GtkAllocation allocation;
-    gtk_widget_get_allocation(GTK_WIDGET(mContainer), &allocation);
-    double scale = FractionalScaleFactor();
-    size.width = round(allocation.width * scale);
-    size.height = round(allocation.height * scale);
-  }
-  return size;
-}
-
 nsWindow* nsWindow::GetWindow(GdkWindow* window) {
   return get_window_for_gdk_window(window);
 }

widget/gtk/nsWindow.h

@@ -274,7 +274,6 @@ class nsWindow final : public nsBaseWidget {
   static guint32 sLastButtonPressTime;
 
   MozContainer* GetMozContainer() { return mContainer; }
-  LayoutDeviceIntSize GetMozContainerSize();
   GdkWindow* GetGdkWindow() const { return mGdkWindow; };
   GdkWindow* GetToplevelGdkWindow() const;
   GtkWidget* GetGtkWidget() const { return mShell; }