service_names.mojom was removed.

Chromium change:

https://chromium.googlesource.com/chromium/src.git/+/23912460644e19c382c223d9115a290f7a4b5394

commit 23912460644e19c382c223d9115a290f7a4b5394
Author: Ken Rockot <[email protected]>
Date:   Wed Dec 9 19:32:42 2020 +0000

    Delete service_names.mojom

    Content hasn't actually used Service Manager-based services in ages, and
    these names are only relevant to those things. They're still used by
    //chromecast, but in extremely limited capacity.

    This moves a few constant definitions into //chromecast C++ code and
    wipes out service_names.mojom. Most of the CL is deletion of stale
    includes of the generated header.

    Bug: 977637

Author: mkarolin

browser/brave_content_browser_client.cc

@@ -46,7 +46,6 @@
 #include "content/public/browser/browser_url_handler.h"
 #include "content/public/browser/navigation_handle.h"
 #include "content/public/common/content_switches.h"
-#include "content/public/common/service_names.mojom.h"
 #include "extensions/buildflags/buildflags.h"
 #include "net/base/registry_controlled_domains/registry_controlled_domain.h"
 #include "net/cookies/site_for_cookies.h"