Fail tests fast if overriding the Windows registry fails.

base/test/test_reg_util_win.h

 // 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.
 
 #ifndef BASE_TEST_TEST_REG_UTIL_WIN_H_
 #define BASE_TEST_TEST_REG_UTIL_WIN_H_
 
 // Registry utility functions used only by tests.
 #include <memory>
 #include <vector>
@@ skipping 21 matching lines @@
 //     two RegistryOverrideManagers created with the same timestamp.
 class RegistryOverrideManager {
  public:
   RegistryOverrideManager();
   ~RegistryOverrideManager();
 
   // Override the given registry hive using a randomly generated temporary key.
   // Multiple overrides to the same hive are not supported and lead to undefined
   // behavior.
   // Optional return of the registry override path.
+  // Calls to these functions must be wrapped in ASSERT_NO_FATAL_FAILURE to
+  // ensure that tests do not proceeed in case of failure to override.
   void OverrideRegistry(HKEY override);
   void OverrideRegistry(HKEY override, base::string16* override_path);
 
  private:
   friend class RegistryOverrideManagerTest;
 
   // Keeps track of one override.
   class ScopedRegistryKeyOverride {
    public:
     ScopedRegistryKeyOverride(HKEY override, const base::string16& key_path);
     ~ScopedRegistryKeyOverride();
 
    private:
     HKEY override_;
-    base::win::RegKey temp_key_;
+    base::string16 key_path_;
 
     DISALLOW_COPY_AND_ASSIGN(ScopedRegistryKeyOverride);
   };
 
   // Used for testing only.
   RegistryOverrideManager(const base::Time& timestamp,
                           const base::string16& test_key_root);
 
   base::Time timestamp_;
   base::string16 guid_;
 
   base::string16 test_key_root_;
   std::vector<std::unique_ptr<ScopedRegistryKeyOverride>> overrides_;
 
   DISALLOW_COPY_AND_ASSIGN(RegistryOverrideManager);
 };
 
 // Generates a temporary key path that will be eventually deleted
 // automatically if the process crashes.
 base::string16 GenerateTempKeyPath();
 
 }  // namespace registry_util
 
 #endif  // BASE_TEST_TEST_REG_UTIL_WIN_H_