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

chrome/test/plugin/plugin_test.cpp

 // Copyright (c) 2010 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.
 
 // Tests for the top plugins to catch regressions in our plugin host code, as
 // well as in the out of process code.  Currently this tests:
 //  Flash
 //  Real
 //  QuickTime
 //  Windows Media Player
@@ skipping 47 matching lines @@
                       L"Software\\Microsoft\\MediaPlayer\\ShimInclusionList",
                       KEY_WRITE)) {
         regkey.CreateKey(L"CHROME.EXE", KEY_READ);
       }
     } else if (strcmp(test_info->name(), "MediaPlayerOld") == 0) {
       // When testing the old WMP plugin, we need to force Chrome to not load
       // the new plugin.
       launch_arguments_.AppendSwitch(kUseOldWMPPluginSwitch);
     } else if (strcmp(test_info->name(), "FlashSecurity") == 0) {
       launch_arguments_.AppendSwitchWithValue(switches::kTestSandbox,
-                                              L"security_tests.dll");
+                                              "security_tests.dll");
     }
 
     UITest::SetUp();
   }
 #endif  // defined(OS_WIN)
 
   void TestPlugin(const std::string& test_case,
                   int timeout,
                   bool mock_http) {
     GURL url = GetTestUrl(test_case, mock_http);
@@ skipping 94 matching lines @@
 
 // http://crbug.com/8690
 TEST_F(PluginTest, DISABLED_Java) {
   TestPlugin("Java.html", action_max_timeout_ms(), false);
 }
 
 TEST_F(PluginTest, Silverlight) {
   TestPlugin("silverlight.html", action_max_timeout_ms(), false);
 }
 #endif  // defined(OS_WIN)