Remove firebase-ml-natural-language related smoke tests.

firebase-ml-natural-language is deprecated in 10/27/2020 release:
https://firebase.google.com/support/release-notes/android#2020-10-27

Author: yifanyang

smoke-tests/build.gradle

@@ -50,12 +50,6 @@ android {
     }
   }
 
-  // As required by Firebase Android Smart Reply doc:
-  // https://firebase.google.com/docs/ml-kit/android/generate-smart-replies#before-you-begin
-  aaptOptions {
-    noCompress "tflite"
-  }
-
   if (project.hasProperty("testBuildType")) {
     testBuildType project.getProperty("testBuildType")
   }
@@ -76,8 +70,6 @@ dependencies {
   implementation "com.google.firebase:firebase-functions"
   implementation "com.google.firebase:firebase-inappmessaging"
   implementation "com.google.firebase:firebase-messaging"
-  implementation "com.google.firebase:firebase-ml-natural-language"
-  implementation "com.google.firebase:firebase-ml-natural-language-smart-reply-model"
   implementation "com.google.firebase:firebase-ml-vision"
   implementation "com.google.firebase:firebase-perf"
   implementation "com.google.firebase:firebase-storage"

smoke-tests/src/main/java/com/google/firebase/testing/BuildOnlyTest.java

@@ -19,7 +19,6 @@
 import com.google.firebase.appindexing.FirebaseAppIndex;
 import com.google.firebase.inappmessaging.FirebaseInAppMessaging;
 import com.google.firebase.messaging.FirebaseMessaging;
-import com.google.firebase.ml.naturallanguage.FirebaseNaturalLanguage;
 import com.google.firebase.perf.FirebasePerformance;
 import com.google.firebase.ml.vision.FirebaseVision;
 import org.junit.Test;
@@ -50,11 +49,6 @@ public void performance_IsNotNull() {
     assertThat(FirebasePerformance.getInstance()).isNotNull();
   }
 
-  @Test
-  public void naturalLanguage_IsNotNull() {
-    assertThat(FirebaseNaturalLanguage.getInstance()).isNotNull();
-  }
-
   @Test
   public void vision_IsNotNull() {
     assertThat(FirebaseVision.getInstance()).isNotNull();