Disable flaky DriveFileSystemExtensionApiTest.FileSystemOperations

TBR=austinct

Bug: 1008880
Change-Id: I9f9987e194fe59cbd8dd239105de76ce680a477f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1852091Reviewed-by: David Roger <droger@chromium.org>
Commit-Queue: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704578}

chrome/browser/chromeos/file_manager/external_filesystem_apitest.cc

@@ -810,13 +810,9 @@ IN_PROC_BROWSER_TEST_F(RestrictedFileSystemExtensionApiTest,
 //
 // DriveFileSystemExtensionApiTests.
 //
-#if defined(LEAK_SANITIZER)
-#define MAYBE_FileSystemOperations DISABLED_FileSystemOperations
-#else
-#define MAYBE_FileSystemOperations FileSystemOperations
-#endif
+// This test is flaky. See https://crbug.com/1008880.
 IN_PROC_BROWSER_TEST_F(DriveFileSystemExtensionApiTest,
-                       MAYBE_FileSystemOperations) {
+                       DISABLED_FileSystemOperations) {
   EXPECT_TRUE(RunFileSystemExtensionApiTest(
       "file_browser/filesystem_operations_test",
       FILE_PATH_LITERAL("manifest.json"),