Allow URLRequests from one context to have different NetworkDelegates.

net/url_request/url_request_throttler_entry_interface.h

Index: net/url_request/url_request_throttler_entry_interface.h
diff --git a/net/url_request/url_request_throttler_entry_interface.h b/net/url_request/url_request_throttler_entry_interface.h
index 48152e1d44bb34ce977bf34fd918c0e8d5c9ea7f..47f5ea16921bdade9bf0d2f6e6d36e3d3829c9e6 100644
--- a/net/url_request/url_request_throttler_entry_interface.h
+++ b/net/url_request/url_request_throttler_entry_interface.h
@@ -14,6 +14,7 @@
 
 namespace net {
 
+class NetworkDelegate;
 class URLRequest;
 class URLRequestThrottlerHeaderInterface;
 
@@ -30,7 +31,9 @@ class NET_EXPORT URLRequestThrottlerEntryInterface
   //
   // URLRequestHttpJob checks this method prior to every request; it
   // cancels requests if this method returns true.
-  virtual bool ShouldRejectRequest(const URLRequest& request) const = 0;
+  virtual bool ShouldRejectRequest(
+      const URLRequest& request,
+      NetworkDelegate* network_delegate) const = 0;
 
   // Calculates a recommended sending time for the next request and reserves it.
   // The sending time is not earlier than the current exponential back-off