WebUI cleanup: Remove unnecessary *_SANITIZER related ifdefs from tests.

chrome/test/data/webui/md_history/md_history_browsertest.js

Index: chrome/test/data/webui/md_history/md_history_browsertest.js
diff --git a/chrome/test/data/webui/md_history/md_history_browsertest.js b/chrome/test/data/webui/md_history/md_history_browsertest.js
index df089087c5860fad322cb75054316e639f37360a..29cf0d8a390832f2b472e4502e6c40afcd07ed49 100644
--- a/chrome/test/data/webui/md_history/md_history_browsertest.js
+++ b/chrome/test/data/webui/md_history/md_history_browsertest.js
@@ -104,10 +104,9 @@ MaterialHistoryListTest.prototype = {
   ]),
 };
 
-// Times out on debug builders and may time out on memory bots because
-// the History page can take several seconds to load in a Debug build. See
-// https://crbug.com/669227.
-GEN('#if defined(MEMORY_SANITIZER) || !defined(NDEBUG)');
+// Times out on debug builders because the History page can take several seconds
+// to load in a Debug build. See https://crbug.com/669227.
+GEN('#if !defined(NDEBUG)');
 GEN('#define MAYBE_All DISABLED_All');
 GEN('#else');
 GEN('#define MAYBE_All All');