Pref service: expose all read-only PrefStores through Mojo

content/browser/browser_context.cc

Index: content/browser/browser_context.cc
diff --git a/content/browser/browser_context.cc b/content/browser/browser_context.cc
index 2f14933f23671dbccfdb75af9bf429144e704f9b..4b668924180c2559bcc25655df680ff0e4f0febe 100644
--- a/content/browser/browser_context.cc
+++ b/content/browser/browser_context.cc
@@ -463,6 +463,13 @@ void BrowserContext::Initialize(
                      BrowserThread::GetTaskRunnerForThread(BrowserThread::DB));
       connection->AddEmbeddedService(file::mojom::kServiceName, info);
     }
+
+    ContentBrowserClient::StaticServiceMap services;
+    GetContentClient()->browser()->RegisterInProcessServices(browser_context,
+                                                             &services);
+    for (const auto& entry : services) {
+      connection->AddEmbeddedService(entry.first, entry.second);
+    }
   }
 }