Add "dont_load_shared_libraries" to android_apk forward list

"dont_load_shared_libraries" is used by Cast internal build. Add it to
forward list.

BUG=None
TEST=CQ

Change-Id: I7e056a163ecf5efd2d456e4479f3bb4f82ec89ea
Reviewed-on: https://chromium-review.googlesource.com/1176359Reviewed-by: Simeon Anfinrud <sanfin@chromium.org>
Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Commit-Queue: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583503}

build/config/android/rules.gni

@@ -2796,6 +2796,7 @@ if (enable_java_templates) {
                                "data_deps",
                                "deps",
                                "dist_ijar_path",
+                               "dont_load_shared_libraries",
                                "emma_never_instrument",
                                "enable_chromium_linker_tests",
                                "enable_multidex",