Move SafariServices and UserNotifications to weak_frameworks.

These frameworks are in newer SDKs than the official deployment target,
and the toolchain sometimes "forgets" to -weak_link them.

Change-Id: I0e4347b42893d1e9638bf52b4449b95291440377
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2427038
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810402}

chrome/browser/BUILD.gn

@@ -4733,9 +4733,11 @@ static_library("browser") {
       "ImageCaptureCore.framework",
       "OpenGL.framework",
       "QuartzCore.framework",
-      "SafariServices.framework",
       "SecurityInterface.framework",
-      "UserNotifications.framework",
+    ]
+    weak_frameworks = [
+      "SafariServices.framework",  # macOS 10.12
+      "UserNotifications.framework",  # macOS 10.14
     ]
   }
 

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

@@ -31,7 +31,9 @@ mac_app_bundle("alert_notification_xpc_service") {
   frameworks = [
     "AppKit.framework",
     "Foundation.framework",
-    "UserNotifications.framework",
+  ]
+  weak_frameworks = [
+    "UserNotifications.framework",  # macOS 10.14
   ]
 
   ldflags = []