Rewrite std::string("") to std::string(), Linux edition.

chrome/test/perf/dom_checker_uitest.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/command_line.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/json/json_string_value_serializer.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/path_service.h"
@@ skipping 125 matching lines @@
     std::string expected_failures_text;
     bool have_expected_results = ReadExpectedResults(failures_file,
                                                      &expected_failures_text);
     if (!have_expected_results)
       return false;
     ParseExpectedFailures(expected_failures_text, expected_failures);
     return true;
   }
 
   bool WaitUntilTestCompletes(TabProxy* tab) {
-    return WaitUntilJavaScriptCondition(tab, L"",
+    return WaitUntilJavaScriptCondition(
+        tab,
+        std::wstring(),
         L"window.domAutomationController.send(automation.IsDone());",
         TestTimeouts::large_test_timeout());
   }
 
   bool GetTestCount(TabProxy* tab, int* test_count) {
-    return tab->ExecuteAndExtractInt(L"",
+    return tab->ExecuteAndExtractInt(
+        std::wstring(),
         L"window.domAutomationController.send(automation.GetTestCount());",
         test_count);
   }
 
   bool GetTestsFailed(TabProxy* tab, ResultsSet* tests_failed) {
     std::wstring json_wide;
-    bool succeeded = tab->ExecuteAndExtractString(L"",
+    bool succeeded = tab->ExecuteAndExtractString(
+        std::wstring(),
         L"window.domAutomationController.send("
         L"    JSON.stringify(automation.GetFailures()));",
         &json_wide);
 
     // Note that we don't use ASSERT_TRUE here (and in some other places) as it
     // doesn't work inside a function with a return type other than void.
     EXPECT_TRUE(succeeded);
     if (!succeeded)
       return false;
 
@@ skipping 76 matching lines @@
 TEST_F(DomCheckerTest, DISABLED_Http) {
   if (!CommandLine::ForCurrentProcess()->HasSwitch(kRunDomCheckerTest))
     return;
 
   ResultsList new_passes, new_failures;
   RunTest(true, &new_passes, &new_failures);
   PrintResults(new_passes, new_failures);
 }
 
 }  // namespace