Make DefaultHttpDataSourceContractTest an instrumentation test

Robolectric uses the JRE HttpURLConnection [1], while real Android
devices and emulators use OkHttp to implement HttpURLConnection. This
can lead to important differences in behaviour, so it's better to use
instrumentation tests when specific HTTP behaviour is important.

[1] https://github.com/robolectric/robolectric/issues/6769#issuecomment-943556156

PiperOrigin-RevId: 408840295

library/datasource/src/androidTest/AndroidManifest.xml

@@ -18,10 +18,12 @@
     xmlns:tools="http://schemas.android.com/tools"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.google.android.exoplayer2.upstream.test">
     package="com.google.android.exoplayer2.upstream.test">
 
 
+  <uses-permission android:name="android.permission.INTERNET"/>
   <uses-sdk/>
   <uses-sdk/>
 
 
   <application
   <application
       android:allowBackup="false"
       android:allowBackup="false"
+      android:usesCleartextTraffic="true"
       tools:ignore="MissingApplicationIcon,HardcodedDebugMode">
       tools:ignore="MissingApplicationIcon,HardcodedDebugMode">
     <provider
     <provider
       android:authorities="com.google.android.exoplayer2.testutil.AssetContentProvider"
       android:authorities="com.google.android.exoplayer2.testutil.AssetContentProvider"