directboot fix (firebase#3544)

Author: VinayGuthal

firebase-messaging-directboot/firebase-messaging-directboot.gradle

@@ -67,7 +67,5 @@ dependencies {
  }
  implementation 'com.google.firebase:firebase-measurement-connector:18.0.0'
  implementation "com.google.firebase:firebase-iid-interop:17.0.0"
- implementation ("com.google.api-client:google-api-client:1.30.9") {
- exclude group: "org.apache.httpcomponents", module: "httpclient"
- }
+ implementation "com.google.errorprone:error_prone_annotations:2.9.0"
 }