CommandLine: add a CopySwitchesFrom() for copying from another CommandLine

chrome/test/memory_test/memory_test.cc

 // Copyright (c) 2006-2009 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.
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "base/process_util.h"
@@ skipping 98 matching lines @@
 #if defined(OS_WIN)
       browser_dir = browser_dir.AppendASCII("chrome");
 #elif defined(OS_LINUX)
       browser_dir = browser_dir.AppendASCII("chrome_linux");
 #elif defined(OS_MACOSX)
       browser_dir = browser_dir.AppendASCII("chrome_mac");
 #endif
       browser_directory_ = browser_dir;
     }
 
-    launch_arguments_.AppendSwitchWithValue(switches::kUserDataDir,
-                                            user_data_dir_.ToWStringHack());
+    launch_arguments_.AppendSwitchPath(switches::kUserDataDir, user_data_dir_);
     UITest::SetUp();
   }
 
   // This memory test loads a set of URLs across a set of tabs, maintaining the
   // number of concurrent open tabs at num_target_tabs.
   // <NEWTAB> is a special URL which informs the loop when we should create a
   // new tab.
   // <PAUSE> is a special URL that informs the loop to pause before proceeding
   // to the next URL.
   void RunTest(const char* test_name, int num_target_tabs) {
@@ skipping 394 matching lines @@
 TEST_F(GeneralMixMemoryTest, TwelveTabTest) {
   RunTest("_12t", 12);
 }
 
 // Commented out until the recorded cache data is added.
 //TEST_F(MembusterMemoryTest, Windows) {
 //  RunTest("membuster", 0);
 //}
 
 }  // namespace