Bug 1606274 - Remove always-false MOZ_GRAPHENE macro. r=firefox-build-system-reviewers,rstewart

Graphene was a B2G UI runtime (added in bug 1115098) used for the browser.html prototype. The Graphene code has since been removed.

Depends on D58358

Differential Revision: https://phabricator.services.mozilla.com/D58359

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

old-configure.in

@@ -1674,11 +1674,6 @@ if test -n "$WITH_APP_BASENAME" ; then
     MOZ_APP_BASENAME="$WITH_APP_BASENAME"
 fi
 
-# Graphene is a desktop runtime for running applications with a HTML UI.
-if test -n "$MOZ_GRAPHENE"; then
-    AC_DEFINE(MOZ_GRAPHENE)
-fi
-
 dnl ========================================================
 dnl Ensure Android SDK and build-tools versions depending on
 dnl mobile target.

toolkit/modules/AppConstants.jsm

@@ -246,13 +246,6 @@ this.AppConstants = Object.freeze({
   false,
 #endif
 
-  MOZ_GRAPHENE:
-#ifdef MOZ_GRAPHENE
-  true,
-#else
-  false,
-#endif
-
   MOZ_SYSTEM_NSS:
 #ifdef MOZ_SYSTEM_NSS
   true,