Remove chrome_app_unittests from chromium_builder_dbg_drmemory_win target

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index acc203c143b692ca031da0b66153847e653a366a..298b2b642b74625c1d4067d14e39ad3682632171 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -1082,7 +1082,9 @@ if (is_win) {
       "//chrome/installer/setup:setup_unittests",
       "//chrome/installer/util:installer_util_unittests",
       "//chrome/test:browser_tests",
-      "//chrome/test:chrome_app_unittests",
+
+      # https://crbug.com/640185
+      # "//chrome/test:chrome_app_unittests",
       "//chrome/test:unit_tests",
       "//chrome/test/chromedriver:chromedriver_unittests",
       "//chrome_elf:chrome_elf_unittests",