[Cros] Disable LocalAndDriveFileSystemExtensionApiTest.AppFileHandlerMulti

In RELEASE approximation: keep it on ASAN MSAN DEBUG waterfall bots.

No-try: true
Tbr: lucmult@
Bug: 946025
Change-Id: I7ff0e557b3b1e0bf3b1d895de4eadb0d78e050f4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1539485Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#644674}

chrome/browser/chromeos/file_manager/external_filesystem_apitest.cc

@@ -908,9 +908,14 @@ IN_PROC_BROWSER_TEST_F(MultiProfileDriveFileSystemExtensionApiTest,
 
 //
 // LocalAndDriveFileSystemExtensionApiTests.
-//
+#if defined(ADDRESS_SANITIZER) || defined(DEBUG) || defined(MEMORY_SANITIZER)
+#define MAYBE_AppFileHandlerMulti AppFileHandlerMulti
+#else
+// http://crbug.com/946025 flaky in RELEASE.
+#define MAYBE_AppFileHandlerMulti DISABLED_AppFileHandlerMulti
+#endif
 IN_PROC_BROWSER_TEST_F(LocalAndDriveFileSystemExtensionApiTest,
-                       AppFileHandlerMulti) {
+                       MAYBE_AppFileHandlerMulti) {
   EXPECT_TRUE(
       RunFileSystemExtensionApiTest("file_browser/app_file_handler_multi",
                                     FILE_PATH_LITERAL("manifest.json"),