Revert "Add warning when developer overrides host without specifying merge (#4925)"

This reverts commit 2a6ad8c.

Author: Brian Chen

packages/firestore/src/api/database.ts

@@ -117,7 +117,7 @@ import {
   validateIsNotUsedTogether,
   validateSetOptions
 } from '../util/input_validation';
-import { logWarn, setLogLevel as setClientLogLevel } from '../util/log';
+import { setLogLevel as setClientLogLevel } from '../util/log';
 
 import { Blob } from './blob';
 import {
@@ -216,26 +216,14 @@ export class Firestore
   }
 
   settings(settingsLiteral: PublicSettings): void {
-    const currentSettings = this._delegate._getSettings();
-    if (
-      !settingsLiteral.merge &&
-      currentSettings.host !== settingsLiteral.host
-    ) {
-      logWarn(
-        'You are overriding the original host. If you did not intend ' +
-          'to override your settings, use {merge: true}.'
-      );
-    }
-
     if (settingsLiteral.merge) {
       settingsLiteral = {
-        ...currentSettings,
+        ...this._delegate._getSettings(),
         ...settingsLiteral
       };
       // Remove the property from the settings once the merge is completed
       delete settingsLiteral.merge;
     }
-
     this._delegate._setSettings(settingsLiteral);
   }