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

chrome/browser/extensions/process_manager_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 "extensions/browser/process_manager.h"
 
 #include "chrome/browser/extensions/browser_action_test_util.h"
 #include "chrome/browser/extensions/extension_browsertest.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
@@ skipping 106 matching lines @@
   ASSERT_EQ(0u, pm->GetAllViews().size());
 
   // Load an extension with a background page.
   scoped_refptr<const Extension> extension =
       LoadExtension(test_data_dir_.AppendASCII("api_test")
                         .AppendASCII("browser_action")
                         .AppendASCII("none"));
 
   // Set up a test server running at http://[extension-id]
   ASSERT_TRUE(extension.get());
-  const std::string aliased_host = extension->id();
+  const std::string& aliased_host = extension->id();
   host_resolver()->AddRule(aliased_host, "127.0.0.1");
   ASSERT_TRUE(embedded_test_server()->InitializeAndWaitUntilReady());
   GURL url =
       embedded_test_server()->GetURL("/extensions/test_file_with_body.html");
   GURL::Replacements replace_host;
   replace_host.SetHostStr(aliased_host);
   url = url.ReplaceComponents(replace_host);
 
   // Load a page from the test host in a new tab.
   ui_test_utils::NavigateToURLWithDisposition(
@@ skipping 14 matching lines @@
       content::WebContents::FromRenderViewHost(
           *pm->GetRenderViewHostsForExtension(extension->id()).begin());
   EXPECT_TRUE(extension_web_contents->GetSiteInstance() !=
               tab_web_contents->GetSiteInstance());
   EXPECT_TRUE(pm->GetSiteInstanceForURL(extension->url()) !=
               tab_web_contents->GetSiteInstance());
   EXPECT_TRUE(pm->GetBackgroundHostForExtension(extension->id()));
 }
 
 }  // namespace extensions