update makefiles to point at new branding location for content images

Makefile.in

@@ -319,6 +319,9 @@ endif # MOZ_COMPONENTLIB
 
 ifdef MOZ_PHOENIX
 tier_99_dirs	+= browser xpfe/bootstrap/init.d
+ifdef MOZ_USE_OFFICIAL_BRANDING
+tier_99_dirs  += other-licenses/branding/firefox/content
+endif
 endif
 
 ifdef MOZ_THUNDERBIRD

allmakefiles.sh

@@ -846,7 +846,10 @@ extensions/typeaheadfind/Makefile
 "
 
 if [ "$MOZ_USE_OFFICIAL_BRANDING" ]; then
-    MAKEFILES_firefox_branding="other-licenses/branding/firefox/Makefile"
+    MAKEFILES_firefox_branding="
+        other-licenses/branding/firefox/Makefile
+        other-licenses/branding/firefox/content/Makefile
+    "
 fi
 
 MAKEFILES_phoenix="