Start refactoring to reduce executable type knowledge.

courgette/base_test_unittest.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 "courgette/base_test_unittest.h"
 
 #include "base/path_service.h"
 
 void BaseTest::SetUp() {
-  PathService::Get(base::DIR_SOURCE_ROOT, &test_dir_);
+  DCHECK(PathService::Get(base::DIR_SOURCE_ROOT, &test_dir_));
   test_dir_ = test_dir_.AppendASCII("courgette");
   test_dir_ = test_dir_.AppendASCII("testdata");
 }
 
 void BaseTest::TearDown() {
 }
 
 //  Reads a test file into a string.
 std::string BaseTest::FileContents(const char* file_name) const {
   FilePath file_path = test_dir_;
@@ skipping 11 matching lines @@
 
   std::list<std::string>::iterator file_name = file_names.begin();
 
   while (file_name != file_names.end()) {
     result += FileContents(file_name->c_str());
     file_name++;
   }
 
   return result;
 }