GN: Move towards only using / on Windows

tools/gn/command_desc.cc

 // Copyright (c) 2013 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 <algorithm>
 #include <set>
 #include <sstream>
 
 #include "base/command_line.h"
 #include "tools/gn/commands.h"
@@ skipping 12 matching lines @@
 
 // Prints the given directory in a nice way for the user to view.
 std::string FormatSourceDir(const SourceDir& dir) {
 #if defined(OS_WIN)
   // On Windows we fix up system absolute paths to look like native ones.
   // Internally, they'll look like "/C:\foo\bar/"
   if (dir.is_system_absolute()) {
     std::string buf = dir.value();
     if (buf.size() > 3 && buf[2] == ':') {
       buf.erase(buf.begin());  // Erase beginning slash.
-      ConvertPathToSystem(&buf);  // Convert to backslashes.
       return buf;
     }
   }
 #endif
   return dir.value();
 }
 
 void RecursiveCollectChildDeps(const Target* target, std::set<Label>* result);
 
 void RecursiveCollectDeps(const Target* target, std::set<Label>* result) {
@@ skipping 331 matching lines @@
   OUTPUT_CONFIG_VALUE(ldflags, std::string)
   PrintLibs(target, true);
   PrintLibDirs(target, true);
 
   PrintDeps(target, true);
 
   return 0;
 }
 
 }  // namespace commands