Use ASCII strings for switch names.

base/test/perf_test_suite.h

 // Copyright (c) 2009 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.
 
 #ifndef BASE_PERF_TEST_SUITE_H_
 #define BASE_PERF_TEST_SUITE_H_
 
 #include "base/command_line.h"
 #include "base/debug_util.h"
 #include "base/file_path.h"
 #include "base/perftimer.h"
 #include "base/process_util.h"
 #include "base/string_util.h"
 #include "base/test/test_suite.h"
 
 class PerfTestSuite : public TestSuite {
  public:
   PerfTestSuite(int argc, char** argv) : TestSuite(argc, argv) {
   }
 
   virtual void Initialize() {
     TestSuite::Initialize();
 
     // Initialize the perf timer log
     FilePath log_path;
     std::wstring log_file =
-        CommandLine::ForCurrentProcess()->GetSwitchValue(L"log-file");
+        CommandLine::ForCurrentProcess()->GetSwitchValue("log-file");
     if (log_file.empty()) {
       FilePath exe;
       PathService::Get(base::FILE_EXE, &exe);
       log_path = exe.ReplaceExtension(FILE_PATH_LITERAL("log"));
       log_path = log_path.InsertBeforeExtension(FILE_PATH_LITERAL("_perf"));
     } else {
       log_path = FilePath::FromWStringHack(log_file);
     }
     ASSERT_TRUE(InitPerfLog(log_path));
 
     // Raise to high priority to have more precise measurements. Since we don't
     // aim at 1% precision, it is not necessary to run at realtime level.
     if (!DebugUtil::BeingDebugged())
       base::RaiseProcessToHighPriority();
   }
 
   virtual void Shutdown() {
     TestSuite::Shutdown();
 
     FinalizePerfLog();
   }
 };
 
 #endif  // BASE_PERF_TEST_SUITE_H_