Remove support for Android API < 23 in PermissionsModule

Summary:
Since minsdk version was increased to 23, we are deleting code using Android APIs < 23 for class PermissionsModule

chnagelog: [Android][Breaking] Remove support for Android API < 23 in PermissionsModule

Differential Revision: D48545517

fbshipit-source-id: e7abe92a8693f87f1159786d1a89a7e98d142128

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/modules/permissions/PermissionsModule.java

@@ -10,8 +10,6 @@
 import android.app.Activity;
 import android.content.Context;
 import android.content.pm.PackageManager;
-import android.os.Build;
-import android.os.Process;
 import android.util.SparseArray;
 import com.facebook.common.logging.FLog;
 import com.facebook.fbreact.specs.NativePermissionsAndroidSpec;
@@ -49,12 +47,6 @@ public PermissionsModule(ReactApplicationContext reactContext) {
   @Override
   public void checkPermission(final String permission, final Promise promise) {
     Context context = getReactApplicationContext().getBaseContext();
-    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
-      promise.resolve(
-          context.checkPermission(permission, Process.myPid(), Process.myUid())
-              == PackageManager.PERMISSION_GRANTED);
-      return;
-    }
     promise.resolve(context.checkSelfPermission(permission) == PackageManager.PERMISSION_GRANTED);
   }
 
@@ -68,10 +60,6 @@ public void checkPermission(final String permission, final Promise promise) {
    */
   @Override
   public void shouldShowRequestPermissionRationale(final String permission, final Promise promise) {
-    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
-      promise.resolve(false);
-      return;
-    }
     try {
       promise.resolve(
           getPermissionAwareActivity().shouldShowRequestPermissionRationale(permission));
@@ -89,14 +77,6 @@ public void shouldShowRequestPermissionRationale(final String permission, final
   @Override
   public void requestPermission(final String permission, final Promise promise) {
     Context context = getReactApplicationContext().getBaseContext();
-    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
-      promise.resolve(
-          context.checkPermission(permission, Process.myPid(), Process.myUid())
-                  == PackageManager.PERMISSION_GRANTED
-              ? GRANTED
-              : DENIED);
-      return;
-    }
     if (context.checkSelfPermission(permission) == PackageManager.PERMISSION_GRANTED) {
       promise.resolve(GRANTED);
       return;
@@ -142,15 +122,7 @@ public void requestMultiplePermissions(final ReadableArray permissions, final Pr
     for (int i = 0; i < permissions.size(); i++) {
       String perm = permissions.getString(i);
 
-      if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
-        grantedPermissions.putString(
-            perm,
-            context.checkPermission(perm, Process.myPid(), Process.myUid())
-                    == PackageManager.PERMISSION_GRANTED
-                ? GRANTED
-                : DENIED);
-        checkedPermissionsCount++;
-      } else if (context.checkSelfPermission(perm) == PackageManager.PERMISSION_GRANTED) {
+      if (context.checkSelfPermission(perm) == PackageManager.PERMISSION_GRANTED) {
         grantedPermissions.putString(perm, GRANTED);
         checkedPermissionsCount++;
       } else {