Cleanup remaining class/struct fwd declarations

tools/gn/config_values_generator.h

 // 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.
 
 #ifndef TOOLS_GN_CONFIG_VALUES_GENERATOR_H_
 #define TOOLS_GN_CONFIG_VALUES_GENERATOR_H_
 
 #include "base/macros.h"
 #include "tools/gn/source_dir.h"
 
 class ConfigValues;
 class Err;
 class Scope;
-class Token;
 
 // This class fills in the config values from a given scope. It's shared
 // between the "config" function call and all the different binary target types
 // (shared library, static library, etc.) since all of these support the
 // various flags stored in the ConfigValues class.
 class ConfigValuesGenerator {
  public:
   ConfigValuesGenerator(ConfigValues* dest_values,
                         Scope* scope,
                         const SourceDir& input_dir,
@@ skipping 12 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(ConfigValuesGenerator);
 };
 
 // For using in documentation for functions which use this.
 #define CONFIG_VALUES_VARS_HELP \
     "  Flags: cflags, cflags_c, cflags_cc, cflags_objc, cflags_objcc,\n" \
     "         asmflags, defines, include_dirs, ldflags, lib_dirs, libs,\n" \
     "         precompiled_header, precompiled_source\n"
 
 #endif  // TOOLS_GN_CONFIG_VALUES_GENERATOR_H_