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

extensions/browser/guest_view/web_view/web_view_apitest.cc

 // Copyright 2014 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/guest_view/web_view/web_view_apitest.h"
 
 #include "base/command_line.h"
 #include "base/path_service.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
@@ skipping 618 matching lines @@
   RunTest("testReassignSrcAttribute", "web_view/apitest");
 }
 
 IN_PROC_BROWSER_TEST_F(WebViewAPITest, TestRemoveWebviewOnExit) {
   StartTestServer();
 
   // Launch the app and wait until it's ready to load a test.
   LaunchApp("web_view/apitest");
 
   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");
 
   // Run the test and wait until the guest WebContents is available and has
   // finished loading.
   ExtensionTestMessageListener guest_loaded_listener("guest-loaded", false);
   EXPECT_TRUE(content::ExecuteScript(embedder_web_contents_,
                                      "runTest('testRemoveWebviewOnExit')"));
 
   content::WebContents* guest_web_contents = GetGuestWebContents();
   EXPECT_TRUE(guest_web_contents->GetRenderProcessHost()->IsIsolatedGuest());
   ASSERT_TRUE(guest_loaded_listener.WaitUntilSatisfied());
@@ skipping 55 matching lines @@
   RunTest("testWebRequestAPIGoogleProperty", "web_view/apitest");
 }
 
 // This test verifies that webview.contentWindow works inside an iframe
 IN_PROC_BROWSER_TEST_F(WebViewAPITest, TestWebViewInsideFrame) {
   LaunchApp("web_view/inside_iframe");
 }
 
 
 }  // namespace extensions