rename to match style

Author: Feiyang1

packages/storage/src/implementation/authwrapper.ts

@@ -42,7 +42,7 @@ import { FirebaseAuthInternal } from '@firebase/auth-interop-types';
  */
 export class AuthWrapper {
   private app_: FirebaseApp | null;
-  private authProvider: Provider<FirebaseAuthInternal>;
+  private authProvider_: Provider<FirebaseAuthInternal>;
   private bucket_: string | null = null;
 
   private storageRefMaker_: (p1: AuthWrapper, p2: Location) => Reference;
@@ -69,7 +69,7 @@ export class AuthWrapper {
         this.bucket_ = AuthWrapper.extractBucket_(options);
       }
     }
-    this.authProvider = authProvider;
+    this.authProvider_ = authProvider;
     this.storageRefMaker_ = maker;
     this.requestMaker_ = requestMaker;
     this.pool_ = pool;
@@ -89,7 +89,7 @@ export class AuthWrapper {
   }
 
   getAuthToken(): Promise<string | null> {
-    const auth = this.authProvider.getImmediate(undefined, { optional: true });
+    const auth = this.authProvider_.getImmediate(undefined, { optional: true });
     if (auth) {
       return auth.getToken().then(
         (response: FirebaseAuthTokenData | null): string | null => {