Remove stack trace from URLFetcher / URLRequest for debugging

net/url_request/url_request.cc

Index: net/url_request/url_request.cc
diff --git a/net/url_request/url_request.cc b/net/url_request/url_request.cc
index d6582e3404ea13ab1d708a1502e27cf70973ffb3..77cbf42bcfe431eddb4b0faad093bbede65e8298 100644
--- a/net/url_request/url_request.cc
+++ b/net/url_request/url_request.cc
@@ -10,7 +10,6 @@
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/compiler_specific.h"
-#include "base/debug/stack_trace.h"
 #include "base/lazy_instance.h"
 #include "base/memory/singleton.h"
 #include "base/message_loop/message_loop.h"
@@ -1191,14 +1190,6 @@ void URLRequest::OnCallToDelegateComplete() {
   net_log_.EndEvent(NetLog::TYPE_URL_REQUEST_DELEGATE);
 }
 
-void URLRequest::set_stack_trace(const base::debug::StackTrace& stack_trace) {
-  stack_trace_.reset(new base::debug::StackTrace(stack_trace));
-}
-
-const base::debug::StackTrace* URLRequest::stack_trace() const {
-  return stack_trace_.get();
-}
-
 void URLRequest::GetConnectionAttempts(ConnectionAttempts* out) const {
   if (job_)
     job_->GetConnectionAttempts(out);