Removed unneeded includes of base/time.h.

net/url_request/url_request.h

Index: net/url_request/url_request.h
===================================================================
--- net/url_request/url_request.h	(revision 11750)
+++ net/url_request/url_request.h	(working copy)
@@ -9,12 +9,15 @@
 #include <vector>
 
 #include "base/ref_counted.h"
-#include "base/time.h"
 #include "googleurl/src/gurl.h"
 #include "net/base/load_states.h"
 #include "net/http/http_response_info.h"
 #include "net/url_request/url_request_status.h"
 
+namespace base {
+  class Time;
+}
+
 namespace net {
 
 class IOBuffer;