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 e4c77c66aa896fd69d75db0705cf7ac559ca2d81..c38dea98591d683e7b66533161a482e1ce4ff7a6 100644
--- a/net/url_request/url_request_context_builder.h
+++ b/net/url_request/url_request_context_builder.h
@@ -28,6 +28,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/task_scheduler/task_traits.h"
 #include "build/build_config.h"
+#include "build/buildflag.h"
 #include "net/base/net_export.h"
 #include "net/base/network_delegate.h"
 #include "net/base/proxy_delegate.h"
@@ -307,10 +308,10 @@ 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);
@@ -411,7 +412,9 @@ 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>>