Remove extra slash from proxy-preconnect path.

chrome/browser/net/spdyproxy/proxy_advisor.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/net/spdyproxy/proxy_advisor.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/prefs/pref_service.h"
@@ skipping 99 matching lines @@
     bool is_preconnect) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
   if (!WouldProxyURL(url))
     return;
 
   std::string motivation_name(MotivationName(motivation, is_preconnect));
   std::string header_value = motivation_name + " " + url.spec();
   net::URLRequestContext* context = context_getter_->GetURLRequestContext();
   std::string endpoint =
-      DataReductionProxySettings::GetDataReductionProxyOrigin();
-  endpoint += "/preconnect";
+      DataReductionProxySettings::GetDataReductionProxyOrigin() + "preconnect";
   scoped_ptr<net::URLRequest> request = context->CreateRequest(
       GURL(endpoint), net::DEFAULT_PRIORITY, this);
   request->set_method("HEAD");
   request->SetExtraRequestHeaderByName(
       "Proxy-Host-Advisory", header_value, false);
   request->SetLoadFlags(net::LOAD_DO_NOT_SEND_COOKIES |
                         net::LOAD_DO_NOT_SAVE_COOKIES |
                         net::LOAD_BYPASS_PROXY |
                         net::LOAD_DISABLE_CACHE);
   net::URLRequest* raw_request = request.get();
@@ skipping 19 matching lines @@
   scoped_ptr<net::URLRequest> scoped_request_for_deletion(request);
   inflight_requests_.erase(request);
   // |scoped_request_for_deletion| will delete |request|
 }
 
 void ProxyAdvisor::UpdateProxyState() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   // Delete all inflight requests. Each request's destructor will call Cancel().
   STLDeleteElements(&inflight_requests_);
 }