Cleanup: Remove some unused code, or make them platform specific.

chrome/browser/chrome_net_benchmarking_message_filter.cc

Index: chrome/browser/chrome_net_benchmarking_message_filter.cc
===================================================================
--- chrome/browser/chrome_net_benchmarking_message_filter.cc	(revision 246675)
+++ chrome/browser/chrome_net_benchmarking_message_filter.cc	(working copy)
@@ -33,11 +33,9 @@
 }  // namespace
 
 ChromeNetBenchmarkingMessageFilter::ChromeNetBenchmarkingMessageFilter(
-    int render_process_id,
     Profile* profile,
     net::URLRequestContextGetter* request_context)
-    : render_process_id_(render_process_id),
-      profile_(profile),
+    : profile_(profile),
       request_context_(request_context) {
 }