Fixes for -Wunused-function on Linux, Android and ChromeOS

net/test/python_utils.cc

 // Copyright (c) 2011 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 "net/test/python_utils.h"
 
 #include "base/base_paths.h"
 #include "base/command_line.h"
 #include "base/environment.h"
 #include "base/file_util.h"
@@ skipping 23 matching lines @@
 #elif defined(OS_POSIX)
     new_path.append(":");
 #endif
     new_path.append(dir_path.c_str());
     env->SetVar(kPythonPathEnv, new_path);
   }
 }
 
 namespace {
 
+#if defined(OS_MACOSX) || defined(OS_CHROMEOS)
 // Search for |to_try|, rolling up the directory tree from
 // |start_dir|.  If found, return true and put the path to |to_try| in
 // |out_dir|.  If not, return false and leave |out_dir| untouched.
 bool TryRelativeToDir(const base::FilePath& start_dir,
                       const base::FilePath& to_try,
                       base::FilePath* out_dir) {
   base::FilePath dir(start_dir);
   while (!base::DirectoryExists(dir.Append(to_try))) {
     base::FilePath parent = dir.DirName();
     if (parent == dir) {
       // We hit the root directory.
       return false;
     }
     dir = parent;
   }
   *out_dir = dir;
   return true;
 }
+#endif  // defined(OS_MACOSX) || defined(OS_CHROMEOS)
 
 }  // namespace
 
 bool GetPyProtoPath(base::FilePath* dir) {
   // Locate the Python code generated by the protocol buffers compiler.
   base::FilePath generated_code_dir;
   if (!PathService::Get(base::DIR_EXE, &generated_code_dir)) {
     LOG(ERROR) << "Can't find " << generated_code_dir.value();
     return false;
   }
@@ skipping 36 matching lines @@
   DCHECK(python_cmd);
 
   python_cmd->SetProgram(base::FilePath(FILE_PATH_LITERAL("python")));
 
   // Launch python in unbuffered mode, so that python output doesn't mix with
   // gtest output in buildbot log files. See http://crbug.com/147368.
   python_cmd->AppendArg("-u");
 
   return true;
 }