Fix Chromium build.

Change-Id: Idd5b105b75f569b4e497545143e32e1f1d0d5525
diff --git a/BUILD.gn b/BUILD.gn
index 9419e87..5b05523 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -13,7 +13,11 @@
 # limitations under the License.
 
 import("gn/perfetto.gni")
-import("gn/standalone/android.gni")
+if (!build_with_chromium) {
+  import("//gn/standalone/android.gni")
+} else {
+  import("//build/config/android/config.gni")
+}
 
 # For use_libfuzzer.
 if (!build_with_chromium) {