clang/win: Let remaining chromium_code targets build with -Wextra.

chrome/installer/util/delete_reg_value_work_item_unittest.cc

 // Copyright (c) 2012 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 <windows.h>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string16.h"
 #include "base/test/test_reg_util_win.h"
 #include "base/win/registry.h"
@@ skipping 74 matching lines @@
   DWORD read_dword;
   EXPECT_EQ(ERROR_SUCCESS, key.ReadValue(kNameStr, &read_str));
   EXPECT_EQ(ERROR_SUCCESS, key.ReadValueDW(kNameDword, &read_dword));
   EXPECT_EQ(read_str, data_str);
   EXPECT_EQ(read_dword, data_dword);
 
   // Verify empty value.
   DWORD type = 0;
   DWORD size = 0;
   EXPECT_EQ(ERROR_SUCCESS, key.ReadValue(kNameEmpty, NULL, &size, &type));
-  EXPECT_EQ(REG_SZ, type);
-  EXPECT_EQ(0, size);
+  EXPECT_EQ(static_cast<DWORD>(REG_SZ), type);
+  EXPECT_EQ(0u, size);
 }
 
 // Try deleting a value that doesn't exist.
 TEST_F(DeleteRegValueWorkItemTest, DeleteNonExistentValue) {
   RegKey key;
   ASSERT_EQ(ERROR_SUCCESS,
             key.Create(HKEY_CURRENT_USER, kTestKey, KEY_READ | KEY_WRITE));
   EXPECT_FALSE(key.HasValue(kNameStr));
   EXPECT_FALSE(key.HasValue(kNameDword));
 
@@ skipping 36 matching lines @@
 
   EXPECT_EQ(ERROR_FILE_NOT_FOUND,
             key.Open(HKEY_CURRENT_USER, kTestKey, KEY_READ));
 
   work_item1->Rollback();
   work_item2->Rollback();
 
   EXPECT_EQ(ERROR_FILE_NOT_FOUND,
             key.Open(HKEY_CURRENT_USER, kTestKey, KEY_READ));
 }