Add AllowStartingServiceManagerOnly to about flags.

Bug: 899225
Change-Id: I3b8a74fadcd4ae1821654e4c37bdbf7985787e72
Reviewed-on: https://chromium-review.googlesource.com/c/1340780
Reviewed-by: Elly Fong-Jones <[email protected]>
Reviewed-by: Min Qin <[email protected]>
Commit-Queue: Henrique Nakashima <[email protected]>
Cr-Commit-Position: refs/heads/master@{#612726}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index a23c0f1..fef6cc3 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -53,6 +53,9 @@
 extern const char kAllowSignedHTTPExchangeCertsWithoutExtensionName[];
 extern const char kAllowSignedHTTPExchangeCertsWithoutExtensionDescription[];
 
+extern const char kAllowStartingServiceManagerOnlyName[];
+extern const char kAllowStartingServiceManagerOnlyDescription[];
+
 extern const char kAndroidMessagesIntegrationName[];
 extern const char kAndroidMessagesIntegrationDescription[];