Remove race condition assert
Remove race condition assert

dougbeal/google-api-swift-client-for-rest,google/google-api-objectivec-client-for-rest,dougbeal/google-api-swift-client-for-rest,dougbeal/google-api-swift-client-for-rest,google/google-api-objectivec-client-for-rest,dougbeal/google-api-swift-client-for-rest,google/google-api-objectivec-client-for-rest,google/google-api-objectivec-client-for-rest,google/google-api-objectivec-client-for-rest