Fail tests fast if overriding the Windows registry fails.

components/user_prefs/tracked/registry_hash_store_contents_win_unittest.cc

 // Copyright (c) 2016 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 "components/user_prefs/tracked/registry_hash_store_contents_win.h"
 
 #include "base/strings/string16.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/test/test_reg_util_win.h"
 #include "base/values.h"
@@ skipping 12 matching lines @@
     "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb";
 
 constexpr char kAtomicPrefPath[] = "path1";
 constexpr char kSplitPrefPath[] = "extension";
 
 class RegistryHashStoreContentsWinTest : public testing::Test {
  protected:
   RegistryHashStoreContentsWinTest() {}
 
   void SetUp() override {
-    registry_override_manager_.OverrideRegistry(HKEY_CURRENT_USER);
+    ASSERT_NO_FATAL_FAILURE(
+        registry_override_manager_.OverrideRegistry(HKEY_CURRENT_USER));
 
     contents.reset(new RegistryHashStoreContentsWin(kRegistryPath, kStoreKey));
   }
 
   std::unique_ptr<HashStoreContents> contents;
 
  private:
   registry_util::RegistryOverrideManager registry_override_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(RegistryHashStoreContentsWinTest);
@@ skipping 66 matching lines @@
   contents->Reset();
 
   stored_mac.clear();
   EXPECT_FALSE(contents->GetMac(kAtomicPrefPath, &stored_mac));
   EXPECT_TRUE(stored_mac.empty());
 
   split_macs.clear();
   EXPECT_FALSE(contents->GetSplitMacs(kSplitPrefPath, &split_macs));
   EXPECT_EQ(0U, split_macs.size());
 }