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

chrome/browser/extensions/api/webstore_private/webstore_private_apitest.cc

 // Copyright (c) 2012 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 <vector>
 
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 116 matching lines @@
 
  protected:
   // Returns a test server URL, but with host 'www.example.com' so it matches
   // the web store app's extent that we set up via command line flags.
   GURL DoGetTestServerURL(const std::string& path) {
     GURL url = test_server()->GetURL(path);
 
     // Replace the host with 'www.example.com' so it matches the web store
     // app's extent.
     GURL::Replacements replace_host;
-    std::string host_str("www.example.com");
-    replace_host.SetHostStr(host_str);
+    replace_host.SetHostStr("www.example.com");
 
     return url.ReplaceComponents(replace_host);
   }
 
   virtual GURL GetTestServerURL(const std::string& path) {
     return DoGetTestServerURL(
         std::string("files/extensions/api_test/webstore_private/") + path);
   }
 
   // Navigates to |page| and runs the Extension API test there. Any downloads
@@ skipping 280 matching lines @@
 // Run tests when the --enable-ephemeral-apps switch is enabled.
 IN_PROC_BROWSER_TEST_F(EphemeralAppWebstorePrivateApiTest, LaunchEphemeralApp) {
   base::CommandLine::ForCurrentProcess()->AppendSwitch(
       switches::kEnableEphemeralAppsInWebstore);
   base::CommandLine::ForCurrentProcess()->AppendSwitch(
       app_list::switches::kEnableExperimentalAppList);
   ASSERT_TRUE(RunInstallTest("webstore_launch_app.html", "app.crx"));
 }
 
 }  // namespace extensions