GURL::Replacements methods accept a StringPiece instead of std::string&.

chrome/browser/apps/guest_view/web_view_interactive_browsertest.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 "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/apps/app_browsertest_util.h"
 #include "chrome/browser/chrome_content_browser_client.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 275 matching lines @@
 
     guest_web_contents_ = GetGuestViewManager()->WaitForGuestAdded();
   }
 
   void RunTest(const std::string& app_name) {
   }
   void SetupTest(const std::string& app_name,
                  const std::string& guest_url_spec) {
     ASSERT_TRUE(StartEmbeddedTestServer());
     GURL::Replacements replace_host;
-    std::string host_str("localhost");  // Must stay in scope with replace_host.
-    replace_host.SetHostStr(host_str);
+    replace_host.SetHostStr("localhost");
 
     GURL guest_url = embedded_test_server()->GetURL(guest_url_spec);
     guest_url = guest_url.ReplaceComponents(replace_host);
 
     ui_test_utils::UrlLoadObserver guest_observer(
         guest_url, content::NotificationService::AllSources());
 
     LoadAndLaunchPlatformApp(app_name.c_str(), "connected");
 
     guest_observer.Wait();
@@ skipping 859 matching lines @@
 
   // Now verify that the selection text propagates properly to RWHV.
   content::RenderWidgetHostView* guest_rwhv =
       guest_web_contents()->GetRenderWidgetHostView();
   ASSERT_TRUE(guest_rwhv);
   std::string selected_text = base::UTF16ToUTF8(guest_rwhv->GetSelectedText());
   ASSERT_TRUE(selected_text.size() >= 10u);
   ASSERT_EQ("AAAAAAAAAA", selected_text.substr(0, 10));
 }
 #endif