Use shared_resources=true for system webview bundle

bundletool was updated with the fix needed for shared_resources=true.

Bug: 1033098
Change-Id: I7b6f540a02d9ab4335e002726d83555d01655c12
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2099285
Auto-Submit: Clark DuVall <cduvall@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749746}

android_webview/system_webview_apk_tmpl.gni

@@ -90,13 +90,7 @@ template("system_webview_apk_or_module_tmpl") {
     _include_secondary_support = false
 
     if (!_use_trichrome_library) {
-      if (_is_bundle_module) {
-        # TODO(b/146491000): aapt2 currently doesn't support the --shared-lib
-        # flag for bundles, so this will only work on M+.
-        app_as_shared_lib = true
-      } else {
       shared_resources = true
-      }
 
       if (!android_64bit_target_cpu || !_pure_32_bit) {
         shared_libraries = [ "//android_webview:libwebviewchromium" ]