Change ExecuteJavaScript* helper functions in browser_test_utils.{h,cc}

content/browser/dom_storage/dom_storage_browsertest.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 "base/path_service.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/public/common/content_paths.h"
 #include "content/public/test/browser_test_utils.h"
 #include "content/shell/shell.h"
 #include "content/test/content_browser_test.h"
@@ skipping 11 matching lines @@
 
   void SimpleTest(const GURL& test_url, bool incognito) {
     // The test page will perform tests then navigate to either
     // a #pass or #fail ref.
     Shell* the_browser = incognito ? CreateOffTheRecordBrowser() : shell();
     NavigateToURLBlockUntilNavigationsComplete(the_browser, test_url, 2);
     std::string result = the_browser->web_contents()->GetURL().ref();
     if (result != "pass") {
       std::string js_result;
       ASSERT_TRUE(ExecuteJavaScriptAndExtractString(
-          the_browser->web_contents()->GetRenderViewHost(), L"",
-          L"window.domAutomationController.send(getLog())", &js_result));
+          the_browser->web_contents()->GetRenderViewHost(),
+          std::string(),
+          "window.domAutomationController.send(getLog())",
+          &js_result));
       FAIL() << "Failed: " << js_result;
     }
   }
 };
 
 static const bool kIncognito = true;
 static const bool kNotIncognito = false;
 
 IN_PROC_BROWSER_TEST_F(DomStorageBrowserTest, SanityCheck) {
   SimpleTest(GetTestUrl("dom_storage", "sanity_check.html"), kNotIncognito);
 }
 
 IN_PROC_BROWSER_TEST_F(DomStorageBrowserTest, SanityCheckIncognito) {
   SimpleTest(GetTestUrl("dom_storage", "sanity_check.html"), kIncognito);
 }
 
 }  // namespace content