Make the Mac build work.

tools/gn/input_file_manager.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_INPUT_FILE_MANAGER_H_
 #define TOOLS_GN_INPUT_FILE_MANAGER_H_
 
 #include <set>
 #include <utility>
 #include <vector>
@@ skipping 48 matching lines @@
   // Loads and parses the given file synchronously, returning the root block
   // corresponding to the parsed result. On error, return NULL and the given
   // Err is set.
   const ParseNode* SyncLoadFile(const LocationRange& origin,
                                 const BuildSettings* build_settings,
                                 const SourceFile& file_name,
                                 Err* err);
 
   int GetInputFileCount() const;
 
-  void GetAllInputFileNames(std::vector<SourceFile>* result) const;
+  // Fills the vector with all input files.
+  void GetAllPhysicalInputFileNames(std::vector<base::FilePath>* result) const;
 
  private:
   friend class base::RefCountedThreadSafe<InputFileManager>;
 
   struct InputFileData {
     InputFileData(const SourceFile& file_name);
     ~InputFileData();
 
     // Don't touch this outside the lock until it's marked loaded.
     InputFile file;
@@ skipping 34 matching lines @@
   mutable base::Lock lock_;
 
   // Maps repo-relative filenames to the corresponding owned pointer.
   typedef base::hash_map<SourceFile, InputFileData*> InputFileMap;
   InputFileMap input_files_;
 
   DISALLOW_COPY_AND_ASSIGN(InputFileManager);
 };
 
 #endif  // TOOLS_GN_INPUT_FILE_MANAGER_H_