Purge the App Launcher code from Mac

chrome/browser/ui/app_list/app_list_controller_browsertest.cc

Index: chrome/browser/ui/app_list/app_list_controller_browsertest.cc
diff --git a/chrome/browser/ui/app_list/app_list_controller_browsertest.cc b/chrome/browser/ui/app_list/app_list_controller_browsertest.cc
index bb0eb859fee2891b3023211be6e301b525902b33..a604ba86c49dffaebd005db22d45ade843635eff 100644
--- a/chrome/browser/ui/app_list/app_list_controller_browsertest.cc
+++ b/chrome/browser/ui/app_list/app_list_controller_browsertest.cc
@@ -125,16 +125,9 @@ class AppListControllerSearchResultsBrowserTest
   DISALLOW_COPY_AND_ASSIGN(AppListControllerSearchResultsBrowserTest);
 };
 
-
-// Flaky on Mac. https://crbug.com/415264
-#if defined(OS_MACOSX)
-#define MAYBE_UninstallSearchResult DISABLED_UninstallSearchResult
-#else
-#define MAYBE_UninstallSearchResult UninstallSearchResult
-#endif
 // Test showing search results, and uninstalling one of them while displayed.
 IN_PROC_BROWSER_TEST_F(AppListControllerSearchResultsBrowserTest,
-                       MAYBE_UninstallSearchResult) {
+                       UninstallSearchResult) {
   base::FilePath test_extension_path;
   ASSERT_TRUE(PathService::Get(chrome::DIR_TEST_DATA, &test_extension_path));
   test_extension_path = test_extension_path.AppendASCII("extensions")