[ar] Disguise 32 bit ArCore lib as 64 bit

This works around a Play Core bug where only 64 bit libraries are extracted on
64 bit devices.

Bug: 902859,902822
Change-Id: Ifd38850a1a88320860d741c740a754cf7cdf3284
Reviewed-on: https://chromium-review.googlesource.com/c/1324105Reviewed-by: agrieve <agrieve@chromium.org>
Commit-Queue: Tibor Goldschwendt <tiborg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606150}

chrome/android/modules/ar/ar_module_tmpl.gni

@@ -43,12 +43,10 @@ template("ar_module_tmpl") {
     if (android_64bit_target_cpu && build_apk_secondary_abi) {
       secondary_abi_loadable_modules = [ "//third_party/arcore-android-sdk/libraries/android_arm/libarcore_sdk_c_minimal.so" ]
 
-      # Bundletool requires all modules of a bundle to support the same set of
-      # architectures. Monochrome base module supports arm64. Add a zero-byte,
-      # "64 bit" dummy library to trick bundletool into thinking that the AR
-      # module does support arm64, too.
-      loadable_modules =
-          [ "//third_party/arcore-android-sdk/libarcore_dummy.so" ]
+      # Disguise 32 bit library as 64 bit. This works around a Play Core bug where only 64 bit
+      # libraries are extracted on 64 bit devices.
+      # TODO(crbug.com/902859): Remove once bug is fixed.
+      loadable_modules = [ "//third_party/arcore-android-sdk/libraries/android_arm/libarcore_sdk_c_minimal.so" ]
     } else if (android_64bit_target_cpu && !build_apk_secondary_abi) {
       loadable_modules = [ "//third_party/arcore-android-sdk/libraries/android_arm64/libarcore_sdk_c_minimal.so" ]
     } else {