Disable BrowsingDataLocalStorageHelperTest.DeleteSingleFile on release

The test is flaky on multiple platforms.

Bug: 1028676
Tbr: msramek@chromium.org
Change-Id: Ib13c169cf919e3e087e0be14aa250b250d4e4f0c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1935232Reviewed-by: Owen Min <zmin@chromium.org>
Commit-Queue: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719301}

chrome/browser/browsing_data/browsing_data_local_storage_helper_browsertest.cc

@@ -121,7 +121,14 @@ IN_PROC_BROWSER_TEST_F(BrowsingDataLocalStorageHelperTest, CallbackCompletes) {
   content::RunMessageLoop();
 }
 
-IN_PROC_BROWSER_TEST_F(BrowsingDataLocalStorageHelperTest, DeleteSingleFile) {
+// Disable due to flaky. https://crbug.com/1028676
+#if defined(NDEBUG)
+#define MAYBE_DeleteSingleFile DISABLED_DeleteSingleFile
+#else
+#define MAYBE_DeleteSingleFile DeleteSingleFile
+#endif
+IN_PROC_BROWSER_TEST_F(BrowsingDataLocalStorageHelperTest,
+                       MAYBE_DeleteSingleFile) {
   scoped_refptr<BrowsingDataLocalStorageHelper> local_storage_helper(
       new BrowsingDataLocalStorageHelper(browser()->profile()));
   CreateLocalStorageFilesForTest();