Ensure tests have an active task runner

chrome/browser/extensions/error_console/error_console_unittest.cc

Index: chrome/browser/extensions/error_console/error_console_unittest.cc
diff --git a/chrome/browser/extensions/error_console/error_console_unittest.cc b/chrome/browser/extensions/error_console/error_console_unittest.cc
index 08cf532cbeaba9385c683036695ebf5bc3d61c79..ce686dd1b6500ee615c7942159aef98497cfcba6 100644
--- a/chrome/browser/extensions/error_console/error_console_unittest.cc
+++ b/chrome/browser/extensions/error_console/error_console_unittest.cc
@@ -13,6 +13,7 @@
 #include "chrome/common/pref_names.h"
 #include "chrome/test/base/testing_profile.h"
 #include "components/crx_file/id_util.h"
+#include "content/public/test/test_browser_thread_bundle.h"
 #include "extensions/browser/extension_error.h"
 #include "extensions/browser/extension_error_test_util.h"
 #include "extensions/browser/extension_registry.h"
@@ -45,6 +46,7 @@ class ErrorConsoleUnitTest : public testing::Test {
   }
 
  protected:
+  content::TestBrowserThreadBundle thread_bundle_;
   scoped_ptr<TestingProfile> profile_;
   ErrorConsole* error_console_;
 };