Fix printing of directory name on gn clean failure

tools/gn/command_clean.cc

 // Copyright 2015 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/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/strings/string_split.h"
 #include "base/strings/stringprintf.h"
 #include "tools/gn/commands.h"
 #include "tools/gn/err.h"
+#include "tools/gn/filesystem_utils.h"
 #include "tools/gn/setup.h"
 
 namespace {
 
 // Extracts from a build.ninja the commands to run GN.
 //
 // The commands to run GN are the gn rule and build.ninja build step at the top
 // of the build.ninja file. We want to keep these when deleting GN builds since
 // we want to preserve the command-line flags to GN.
 //
@@ skipping 56 matching lines @@
     return 1;
 
   base::FilePath build_dir(setup->build_settings().GetFullPath(
       SourceDir(setup->build_settings().build_dir().value())));
 
   // NOTE: Not all GN builds have args.gn file hence we check here
   // if a build.ninja.d files exists instead.
   base::FilePath build_ninja_d_file = build_dir.AppendASCII("build.ninja.d");
   if (!base::PathExists(build_ninja_d_file)) {
     Err(Location(),
-        base::StringPrintf("%s does not look like a build directory.\n",
-                           build_ninja_d_file.DirName().value().c_str()))
+        base::StringPrintf(
+            "%s does not look like a build directory.\n",
+            FilePathToUTF8(build_ninja_d_file.DirName().value()).c_str()))
         .PrintToStdout();
     return 1;
   }
 
   // Erase everything but the args file, and write a dummy build.ninja file that
   // will automatically rerun GN the next time Ninja is run.
   base::FilePath build_ninja_file = build_dir.AppendASCII("build.ninja");
   std::string build_commands = ExtractGNBuildCommands(build_ninja_file);
 
   // Read the args.gn file, if any. Not all GN builds have one.
@@ skipping 42 matching lines @@
                       static_cast<int>(dummy_content.size())) == -1) {
     Err(Location(), std::string("Failed to write build.ninja.d."))
         .PrintToStdout();
     return 1;
   }
 
   return 0;
 }
 
 }  // namespace commands