Make URLRequestThrottlerManager a member of URLRequestContext.

chrome/browser/profiles/off_the_record_profile_io_data.cc

Index: chrome/browser/profiles/off_the_record_profile_io_data.cc
diff --git a/chrome/browser/profiles/off_the_record_profile_io_data.cc b/chrome/browser/profiles/off_the_record_profile_io_data.cc
index c0507d123e45a2ade5b4947b862cf11df6b8b78b..ab4e239b36d596ff5974c3aef7a0d31708ce8d26 100644
--- a/chrome/browser/profiles/off_the_record_profile_io_data.cc
+++ b/chrome/browser/profiles/off_the_record_profile_io_data.cc
@@ -177,6 +177,11 @@ void OffTheRecordProfileIOData::LazyInitializeInternal(
       fraudulent_certificate_reporter());
   main_context->set_proxy_service(proxy_service());
 
+  main_context->set_throttler_manager(
+      io_thread_globals->throttler_manager.get());
+  extensions_context->set_throttler_manager(
+      io_thread_globals->throttler_manager.get());
+
   // For incognito, we use the default non-persistent HttpServerPropertiesImpl.
   http_server_properties_.reset(new net::HttpServerPropertiesImpl);
   main_context->set_http_server_properties(http_server_properties_.get());