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

extensions/browser/extension_prefs.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "extensions/browser/extension_prefs.h"
 
 #include <iterator>
 
 #include "base/command_line.h"
 #include "base/metrics/histogram_macros.h"
@@ skipping 525 matching lines @@
   return GetExtensionPref(extension_id) != NULL;
 }
 
 bool ExtensionPrefs::ReadPrefAsURLPatternSet(const std::string& extension_id,
                                              const std::string& pref_key,
                                              URLPatternSet* result,
                                              int valid_schemes) {
   const base::ListValue* value = NULL;
   if (!ReadPrefAsList(extension_id, pref_key, &value))
     return false;
+  const base::DictionaryValue* extension = GetExtensionPref(extension_id);
+  if (!extension)
+    return false;
+  int location;
+  if (extension->GetInteger(kPrefLocation, &location) &&
+      static_cast<Manifest::Location>(location) == Manifest::COMPONENT) {
+    valid_schemes |= URLPattern::SCHEME_CHROMEUI;
+  }
 
   bool allow_file_access = AllowFileAccess(extension_id);
   return result->Populate(*value, valid_schemes, allow_file_access, NULL);
 }
 
 void ExtensionPrefs::SetExtensionPrefURLPatternSet(
     const std::string& extension_id,
     const std::string& pref_key,
     const URLPatternSet& new_value) {
   UpdateExtensionPref(extension_id, pref_key, new_value.ToValue().release());
@@ skipping 1582 matching lines @@
   extension_pref_value_map_->RegisterExtension(
       extension_id, install_time, is_enabled, is_incognito_enabled);
 
   FOR_EACH_OBSERVER(
       ExtensionPrefsObserver,
       observer_list_,
       OnExtensionRegistered(extension_id, install_time, is_enabled));
 }
 
 }  // namespace extensions