Remove chrome_app_unittests from chromium_builder_dbg_drmemory_win target

This should probably fix the compile step on the Dr. Memory builder.

BUG=640185
TBR=dpranke@chromium.org,cpu@chromium.org
NOTRY=true

Review-Url: https://codereview.chromium.org/2286623002
Cr-Commit-Position: refs/heads/master@{#414670}

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",