Introduce a delegate to avoid hardcoding "chrome-extension" in net/.

net/url_request/url_request_throttler_simulation_unittest.cc

Index: net/url_request/url_request_throttler_simulation_unittest.cc
diff --git a/net/url_request/url_request_throttler_simulation_unittest.cc b/net/url_request/url_request_throttler_simulation_unittest.cc
index 256d343f45e20b0e9e5c94de8dbc9c931d1bc015..35514fc9a798c03c6a2f2911ec063889fab6e737 100644
--- a/net/url_request/url_request_throttler_simulation_unittest.cc
+++ b/net/url_request/url_request_throttler_simulation_unittest.cc
@@ -20,6 +20,7 @@
 #include "base/memory/scoped_vector.h"
 #include "base/rand_util.h"
 #include "base/time.h"
+#include "net/url_request/url_request_test_util.h"
 #include "net/url_request/url_request_throttler_manager.h"
 #include "net/url_request/url_request_throttler_test_support.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -159,7 +160,7 @@ class Server : public DiscreteTimeSimulation::Actor {
     ++num_current_tick_queries_;
     if (!start_downtime_.is_null() &&
         start_downtime_ < now_ && now_ < end_downtime_) {
-      // TODO(joi): For the simulation measuring the increase in perceived
+      // For the simulation measuring the increase in perceived
       // downtime, it might be interesting to count separately the
       // queries seen by the server (assuming a front-end reverse proxy
       // is what actually serves up the 503s in this case) so that we could
@@ -287,8 +288,11 @@ class Server : public DiscreteTimeSimulation::Actor {
 
 class TestingURLRequestThrottlerManager : public URLRequestThrottlerManager {
  public:
-  TestingURLRequestThrottlerManager() : URLRequestThrottlerManager() {
+  TestingURLRequestThrottlerManager() : URLRequestThrottlerManager(&delegate_) {
   }
+
+ private:
+  TestURLRequestThrottlerManagerDelegate delegate_;
 };
 
 // Mock throttler entry used by Requester class.
@@ -427,7 +431,7 @@ class Requester : public DiscreteTimeSimulation::Actor {
 
     if (throttler_entry_->fake_now() - time_of_last_attempt_ >
         effective_delay) {
-      if (!throttler_entry_->ShouldRejectRequest(0)) {
+      if (!throttler_entry_->ShouldRejectRequest(NULL, 0)) {
         int status_code = server_->HandleRequest();
         MockURLRequestThrottlerHeaderAdapter response_headers(status_code);
         throttler_entry_->UpdateWithResponse("", &response_headers);