[Mac] Version the Chromium Framework if enable_xpc_notifications is true.

chrome/BUILD.gn

Index: chrome/BUILD.gn
diff --git a/chrome/BUILD.gn b/chrome/BUILD.gn
index ff39b519d94dde85d8a23cbab717a763e9cf01a5..d5a3f5db0e59b7773d520f5ac77a66f2afd3ff2f 100644
--- a/chrome/BUILD.gn
+++ b/chrome/BUILD.gn
@@ -951,6 +951,7 @@ if (is_win) {
   target(_dll_target_type, "chrome_dll") {
     visibility = [
       ":chrome_framework",
+      ":chrome_framework_create_bundle",
       ":chrome_framework_shared_library",
     ]
 
@@ -1001,6 +1002,10 @@ if (is_win) {
   mac_framework_bundle("chrome_framework") {
     output_name = chrome_framework_name
 
+    if (enable_xpc_notifications) {
+      framework_version = "A"
+    }
+
     configs += [ "//build/config/compiler:wexit_time_destructors" ]
 
     info_plist_target = ":chrome_framework_plist"