Stop using third_party\python_26 for many tests.

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 91 matching lines @@
   generated_code_dir = *dir;
 #endif
   *dir = generated_code_dir.Append(kPyProto);
   VLOG(2) << "Found " << kPyProto.value() << " in " << dir->value();
   return true;
 }
 
 bool GetPythonCommand(CommandLine* python_cmd) {
   DCHECK(python_cmd);
 
+#if defined(OS_WIN)
+  python_cmd->SetProgram(base::FilePath(FILE_PATH_LITERAL("cmd.exe")));

[Paweł Hajdan Jr., 2013/11/16 00:13:50]

Why do we need to go through cmd.exe /c ?

+  python_cmd->AppendArg("/c");
+  python_cmd->AppendArg("python");
+

[Paweł Hajdan Jr., 2013/11/16 00:13:50]

nit: Remove empty line.

+#elif defined(OS_POSIX)
   python_cmd->SetProgram(base::FilePath(FILE_PATH_LITERAL("python")));
-
+#endif
   // 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;
 }