Fix for ERROR:url_pattern_set.cc(240)] Invalid url pattern: chrome://print/*

chrome/browser/extensions/test_extension_prefs.cc

Index: chrome/browser/extensions/test_extension_prefs.cc
diff --git a/chrome/browser/extensions/test_extension_prefs.cc b/chrome/browser/extensions/test_extension_prefs.cc
index 4c98c5a12da221cfe0a06c7ee5c9a6271a0e2e99..11f8317d40693dcc8842ad86822808dc283f1851 100644
--- a/chrome/browser/extensions/test_extension_prefs.cc
+++ b/chrome/browser/extensions/test_extension_prefs.cc
@@ -176,6 +176,13 @@ std::string TestExtensionPrefs::AddExtensionAndReturnId(
   return extension->id();
 }
 
+void TestExtensionPrefs::AddExtension(Extension* extension) {
+  prefs_->OnExtensionInstalled(extension,
+                               Extension::ENABLED,
+                               syncer::StringOrdinal::CreateInitialOrdinal(),
+                               std::string());
+}
+
 PrefService* TestExtensionPrefs::CreateIncognitoPrefService() const {
   return pref_service_->CreateIncognitoPrefService(
       new ExtensionPrefStore(extension_pref_value_map_.get(), true));