Convert UtilityProcessHost to bootstrap Mojo Channel using the Shell connection

chrome/browser/extensions/extension_service_test_base.cc

Index: chrome/browser/extensions/extension_service_test_base.cc
diff --git a/chrome/browser/extensions/extension_service_test_base.cc b/chrome/browser/extensions/extension_service_test_base.cc
index 8266871f7c88e2f212d14288ddb0aa7cc1e97104..428ab644cf2b72d917245169870ca94fbb780774 100644
--- a/chrome/browser/extensions/extension_service_test_base.cc
+++ b/chrome/browser/extensions/extension_service_test_base.cc
@@ -30,6 +30,7 @@
 #include "components/syncable_prefs/pref_service_mock_factory.h"
 #include "components/syncable_prefs/pref_service_syncable.h"
 #include "content/public/browser/browser_context.h"
+#include "content/public/browser/shell_context.h"
 #include "extensions/browser/extension_prefs.h"
 #include "extensions/browser/extension_registry.h"
 
@@ -285,6 +286,7 @@ void ExtensionServiceTestBase::ValidateStringPref(
 }
 
 void ExtensionServiceTestBase::SetUp() {
+  shell_context_ = content::ShellContext::Create();
   ExtensionErrorReporter::GetInstance()->ClearErrors();
 }