Add enable_reporting to fix size regression in Cronet.

net/url_request/url_request_context_builder.h

Index: net/url_request/url_request_context_builder.h
diff --git a/net/url_request/url_request_context_builder.h b/net/url_request/url_request_context_builder.h
index 2a520017cae85457ef517e3a0daf942eba8e52dc..fcb4b1e753cba445a0b78333c58b559dd896393b 100644
--- a/net/url_request/url_request_context_builder.h
+++ b/net/url_request/url_request_context_builder.h
@@ -304,10 +304,10 @@ class NET_EXPORT URLRequestContextBuilder {
 
   void SetCertVerifier(std::unique_ptr<CertVerifier> cert_verifier);
 
-  // Sets the reporting policy of the created request context. If not set, or
-  // set to nullptr, reporting is disabled.
+#if BUILDFLAG(ENABLE_REPORTING)
   void set_reporting_policy(
       std::unique_ptr<net::ReportingPolicy> reporting_policy);
+#endif  // BUILDFLAG(ENABLE_REPORTING)
 
   void SetInterceptors(std::vector<std::unique_ptr<URLRequestInterceptor>>
                            url_request_interceptors);
@@ -398,7 +398,9 @@ class NET_EXPORT URLRequestContextBuilder {
   std::unique_ptr<HttpAuthHandlerFactory> http_auth_handler_factory_;
   std::unique_ptr<CertVerifier> cert_verifier_;
   std::unique_ptr<CTVerifier> ct_verifier_;
+#if BUILDFLAG(ENABLE_REPORTING)
   std::unique_ptr<net::ReportingPolicy> reporting_policy_;
+#endif  // BUILDFLAG(ENABLE_REPORTING)
   std::vector<std::unique_ptr<URLRequestInterceptor>> url_request_interceptors_;
   std::unique_ptr<HttpServerProperties> http_server_properties_;
   std::map<std::string, std::unique_ptr<URLRequestJobFactory::ProtocolHandler>>