Use PlatformThreadId, not int when dealing with thread ids.

net/url_request/url_request_job_manager.h

Index: net/url_request/url_request_job_manager.h
diff --git a/net/url_request/url_request_job_manager.h b/net/url_request/url_request_job_manager.h
index d5924a05e38f6c77ce31e03b60bd9fe82d78bace..dab33332b80d99616b79240fc92aaeff26379333 100644
--- a/net/url_request/url_request_job_manager.h
+++ b/net/url_request/url_request_job_manager.h
@@ -57,7 +57,7 @@ class URLRequestJobManager {
 #ifndef NDEBUG
   // We use this to assert that CreateJob and the registration functions all
   // run on the same thread.
-  mutable int allowed_thread_;
+  mutable PlatformThreadId allowed_thread_;
   mutable bool allowed_thread_initialized_;
 
   // The first guy to call this function sets the allowed thread.  This way we