Add a native test target and for android_webview.

android_webview/lib/main/webview_tests.cc

Index: android_webview/lib/main/webview_tests.cc
diff --git a/chrome/test/base/app_mode_app_tests.cc b/android_webview/lib/main/webview_tests.cc
similarity index 89%
copy from chrome/test/base/app_mode_app_tests.cc
copy to android_webview/lib/main/webview_tests.cc
index 16a5205e925e9840d606126e4f99191f6c41785b..2c8d29c6d00885e8e8c27f74a105e94cb5c96fa4 100644
--- a/chrome/test/base/app_mode_app_tests.cc
+++ b/android_webview/lib/main/webview_tests.cc
@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "build/build_config.h"
-
 #include "base/test/test_suite.h"
 
 int main(int argc, char** argv) {