Use extensions::ResultCatcher; delete ExtensionApiTest::ResultCatcher.

chrome/browser/extensions/stubs_apitest.cc

Index: chrome/browser/extensions/stubs_apitest.cc
diff --git a/chrome/browser/extensions/stubs_apitest.cc b/chrome/browser/extensions/stubs_apitest.cc
index 2c16ce834f7687b0b127d9e3a91e8e0236be19d3..052a2dbee250687b1f77f075063e5f48f482d418 100644
--- a/chrome/browser/extensions/stubs_apitest.cc
+++ b/chrome/browser/extensions/stubs_apitest.cc
@@ -5,6 +5,7 @@
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/test/base/ui_test_utils.h"
+#include "extensions/test/result_catcher.h"
 #include "net/test/embedded_test_server/embedded_test_server.h"
 #include "url/gurl.h"
 
@@ -26,7 +27,7 @@ IN_PROC_BROWSER_TEST_F(ExtensionApiTest, MAYBE_Stubs) {
   GURL url(embedded_test_server()->GetURL("/extensions/test_file.html"));
   ui_test_utils::NavigateToURL(browser(), url);
 
-  ResultCatcher catcher;
+  extensions::ResultCatcher catcher;
   ASSERT_TRUE(catcher.GetNextResult());
 }