Move interface registration to OnConnect in RPH

blimp/engine/app/blimp_content_browser_client.cc

Index: blimp/engine/app/blimp_content_browser_client.cc
diff --git a/blimp/engine/app/blimp_content_browser_client.cc b/blimp/engine/app/blimp_content_browser_client.cc
index 2afbe417c63db231c4f2c3d2f7719addb45fcc8b..17def3952bb6f337c6c0fee57f01c07cd4ff8cb0 100644
--- a/blimp/engine/app/blimp_content_browser_client.cc
+++ b/blimp/engine/app/blimp_content_browser_client.cc
@@ -6,6 +6,9 @@
 #include "blimp/engine/app/blimp_browser_main_parts.h"
 #include "blimp/engine/app/settings_manager.h"
 #include "blimp/engine/mojo/blob_channel_service.h"
+#include "blimp/net/blob_channel/blob_channel_sender.h"
+#include "content/public/browser/browser_thread.h"
+#include "services/shell/public/cpp/connection.h"
 #include "services/shell/public/cpp/interface_registry.h"
 
 namespace blimp {
@@ -40,11 +43,17 @@ BlimpBrowserContext* BlimpContentBrowserClient::GetBrowserContext() {
 }
 
 void BlimpContentBrowserClient::ExposeInterfacesToRenderer(
-    shell::InterfaceRegistry* registry,
-    content::RenderProcessHost* render_process_host) {
-  registry->AddInterface<mojom::BlobChannel>(
-      base::Bind(&BlobChannelService::Create,
-                 blimp_browser_main_parts_->GetBlobChannelSender()));
+    shell::Connection* connection) {
+  connection->GetInterfaceRegistry()->AddInterface(base::Bind(
+      &BlimpContentBrowserClient::BindBlobChannel, base::Unretained(this)),
+      content::BrowserThread::GetTaskRunnerForThread(
+          content::BrowserThread::UI));
+}
+
+void BlimpContentBrowserClient::BindBlobChannel(
+    mojom::BlobChannelRequest request) {
+  BlobChannelService::Create(blimp_browser_main_parts_->GetBlobChannelSender(),
+                             std::move(request));
 }
 
 }  // namespace engine