Disable SettingsLanguagesPageBrowserTest.LanguagesPage

Flakiness has expanded from just Windows and memory bots to Mac and
Linux as well.

Broadly disabling the test.

BUG=641400
TBR=michaelpg@chromium.org

Review-Url: https://codereview.chromium.org/2828063002
Cr-Commit-Position: refs/heads/master@{#465721}

chrome/test/data/webui/settings/languages_page_browsertest.js

@@ -31,15 +31,14 @@ SettingsLanguagesPageBrowserTest.prototype = {
   },
 };
 
-// Flaky on Windows. See https://crbug.com/641400.
-// May time out on debug builders and memory bots because
-// the Settings page can take several seconds to load in a Release build
-// and several times that in a Debug build. See https://crbug.com/558434.
-GEN('#if defined(OS_WINDOWS) || defined(MEMORY_SANITIZER) || !defined(NDEBUG)');
+// Flaky on Windows, Mac and Linux. See https://crbug.com/641400.
+//
+// May time out on debug builders and memory bots because the Settings page can
+// take several seconds to load in a Release build and several times that in a
+// Debug build. See https://crbug.com/558434.
+//
+// Disabling this test in general.
 GEN('#define MAYBE_LanguagesPage DISABLED_LanguagesPage');
-GEN('#else');
-GEN('#define MAYBE_LanguagesPage LanguagesPage');
-GEN('#endif');
 
 // Runs languages page tests.
 TEST_F('SettingsLanguagesPageBrowserTest', 'MAYBE_LanguagesPage', function() {