Type conversion fixes, tools/ edition.

tools/gn/filesystem_utils.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 "tools/gn/filesystem_utils.h"
 
 #include <algorithm>
 
 #include "base/files/file_util.h"
 #include "base/logging.h"
@@ skipping 114 matching lines @@
   // Don't use IsSeparator since we always want to allow backslashes.
   if (result[0] == FILE_PATH_LITERAL("/") ||
       result[0] == FILE_PATH_LITERAL("\\"))
     result.erase(result.begin());
 
 #if defined(OS_WIN)
   // On Windows, GetComponents will give us [ "C:", "/", "foo" ], and we
   // don't want the slash in there. This doesn't support input like "C:foo"
   // which means foo relative to the current directory of the C drive but
   // that's basically legacy DOS behavior we don't need to support.
-  if (result.size() >= 2 && result[1].size() == 1 && IsSlash(result[1][0]))
+  if (result.size() >= 2 && result[1].size() == 1 &&
+      IsSlash(static_cast<char>(result[1][0])))
     result.erase(result.begin() + 1);
 #endif
 
   return result;
 }
 
 // Provides the equivalent of == for filesystem strings, trying to do
 // approximately the right thing with case.
 bool FilesystemStringsEqual(const base::FilePath::StringType& a,
                             const base::FilePath::StringType& b) {
@@ skipping 598 matching lines @@
 
 SourceDir GetCurrentOutputDir(const Scope* scope) {
   return GetOutputDirForSourceDirAsOutputFile(
       scope->settings(), scope->GetSourceDir()).AsSourceDir(
           scope->settings()->build_settings());
 }
 
 SourceDir GetCurrentGenDir(const Scope* scope) {
   return GetGenDirForSourceDir(scope->settings(), scope->GetSourceDir());
 }