Enforce lowercase switches when calling CommandLine::HasSwitch(const char*).

base/command_line.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 <algorithm>
 #include <ostream>
 
 #include "base/basictypes.h"
@@ skipping 245 matching lines @@
 
 FilePath CommandLine::GetProgram() const {
   return FilePath(argv_[0]);
 }
 
 void CommandLine::SetProgram(const FilePath& program) {
   TrimWhitespace(program.value(), TRIM_ALL, &argv_[0]);
 }
 
 bool CommandLine::HasSwitch(const std::string& switch_string) const {
-  return switches_.find(LowerASCIIOnWindows(switch_string)) != switches_.end();
+  DCHECK_EQ(StringToLowerASCII(switch_string), switch_string);
+  return switches_.find(switch_string) != switches_.end();
 }
 
 bool CommandLine::HasSwitch(const char string_constant[]) const {
   return HasSwitch(std::string(string_constant));
 }
 
 std::string CommandLine::GetSwitchValueASCII(
     const std::string& switch_string) const {
   StringType value = GetSwitchValueNative(switch_string);
   if (!IsStringASCII(value)) {
@@ skipping 169 matching lines @@
 #if defined(OS_WIN)
       arg = QuoteForCommandLineToArgvW(arg, quote_placeholders);
 #endif
       params.append(arg);
     }
   }
   return params;
 }
 
 }  // namespace base