Enable opening http://localhost WebAPK in WebAPK mode

chrome/android/webapk/shell_apk/AndroidManifest.xml

Index: chrome/android/webapk/shell_apk/AndroidManifest.xml
diff --git a/chrome/android/webapk/shell_apk/AndroidManifest.xml b/chrome/android/webapk/shell_apk/AndroidManifest.xml
index 5ae93fc8afe5d43e607a68bee887e9beaef9e8fd..1e40170fd1adb8663aedcdae3d0817fbc044bde5 100644
--- a/chrome/android/webapk/shell_apk/AndroidManifest.xml
+++ b/chrome/android/webapk/shell_apk/AndroidManifest.xml
@@ -28,7 +28,7 @@
                 <action android:name="android.intent.action.VIEW"></action>
                 <category android:name="android.intent.category.DEFAULT"></category>
                 <category android:name="android.intent.category.BROWSABLE"></category>
-                <data android:scheme="https" android:host="{{ scope_url_host }}" android:pathPrefix="{{ scope_url_path }}"></data>
+                <data android:scheme="{{ scope_url_scheme }}" android:host="{{ scope_url_host }}" android:pathPrefix="{{ scope_url_path }}"></data>
             </intent-filter>
         </activity>
         <activity android:name="org.chromium.webapk.shell_apk.NotificationSettingsLauncherActivity">