Remove redundant @TargetApi, @RequiresApi and @SuppressWarnings

Test: Existing tests
PiperOrigin-RevId: 202589482
Change-Id: I6982e4069d30032bf46caf3c9984dfc0e7196f6f
diff --git a/java/com/android/incallui/CallButtonPresenter.java b/java/com/android/incallui/CallButtonPresenter.java
index 274071a..be80343 100644
--- a/java/com/android/incallui/CallButtonPresenter.java
+++ b/java/com/android/incallui/CallButtonPresenter.java
@@ -16,9 +16,7 @@
 
 package com.android.incallui;
 
-import android.annotation.TargetApi;
 import android.content.Context;
-import android.os.Build.VERSION_CODES;
 import android.os.Bundle;
 import android.os.Trace;
 import android.support.v4.app.Fragment;
@@ -445,8 +443,7 @@
    *
    * @param call The active call.
    */
-  @TargetApi(VERSION_CODES.N)
-  @SuppressWarnings(value = {"MissingPermission", "AndroidApiChecker"}) // Java 8 APIs.
+  @SuppressWarnings(value = {"MissingPermission"})
   private void updateButtonsState(DialerCall call) {
     LogUtil.v("CallButtonPresenter.updateButtonsState", "");
     final boolean isVideo = call.isVideoCall();