Issue #1516 - Part 1: Add a global build define to determine if the client can draw in the titlebar and update consumers of the local define

toolkit/modules/AppConstants.jsm

@@ -209,7 +209,7 @@ MOZ_SAFE_BROWSING:
 #endif
 
   CAN_DRAW_IN_TITLEBAR:
-#ifdef CAN_DRAW_IN_TITLEBAR
+#ifdef MOZ_CAN_DRAW_IN_TITLEBAR
   true,
 #else
   false,

toolkit/modules/LightweightThemeConsumer.jsm

@@ -147,7 +147,7 @@ LightweightThemeConsumer.prototype = {
         footer.removeAttribute("lwthemefooter");
     }
 
-#ifdef XP_MACOSX
+#if defined(XP_MACOSX) && defined(MOZ_CAN_DRAW_IN_TITLEBAR)
     // On OS X, we extend the lightweight theme into the titlebar, which means setting
     // the chromemargin attribute. Some XUL applications already draw in the titlebar,
     // so we need to save the chromemargin value before we overwrite it with the value

toolkit/modules/moz.build

@@ -92,9 +92,6 @@ EXTRA_PP_JS_MODULES += [
     'WindowDraggingUtils.jsm',
 ]
 
-if CONFIG['MOZ_WIDGET_TOOLKIT'] in ('windows', 'cocoa'):
-    DEFINES['CAN_DRAW_IN_TITLEBAR'] = 1
-
 if CONFIG['MOZ_WIDGET_TOOLKIT'] in ('windows', 'gtk2', 'gtk3'):
     DEFINES['MENUBAR_CAN_AUTOHIDE'] = 1