[Mac] Fix the rpath for AlertNotificationService.xpc

After https://crrev.com/c/1592230 the relative path to the framework
changed but this rpath was not updated.

Bug: None
Change-Id: I69b044c96a7eefb09534b62245545e20714b92ad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1986834Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Richard Knoll <knollr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#728636}

chrome/browser/ui/cocoa/notifications/BUILD.gn

@@ -36,12 +36,12 @@ mac_app_bundle("alert_notification_xpc_service") {
   ldflags = []
   if (is_component_build) {
     ldflags += [
-      # The XPC service is in Chromium.app/Contents/Versions/X/Chromium \
+      # The XPC service is in Chromium.app/Contents/Frameworks/Chromium \
       # Framework.framework/Versions/A/XPCServices/ \
       # AlertNotificationService.xpc/Contents/MacOS/
       # so set rpath up to the base.
       "-rpath",
-      "@loader_path/../../../../../../../../../../../",
+      "@loader_path/../../../../../../../../../../",
     ]
   }
 }