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

chrome/installer/util/set_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 <string>
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
@@ skipping 198 matching lines @@
   work_item1->Rollback();
   work_item2->Rollback();
 
   EXPECT_TRUE(test_key_.HasValue(kNameStr));
   EXPECT_EQ(ERROR_SUCCESS, test_key_.ReadValue(kNameStr, &read_out));
   EXPECT_EQ(read_out, kDataStr1);
 
   DWORD type = 0;
   DWORD size = 0;
   EXPECT_EQ(ERROR_SUCCESS, test_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);
 
   // Now test REG_DWORD value.
   // Write data to the value we are going to set.
   ASSERT_EQ(ERROR_SUCCESS, test_key_.WriteValue(kNameDword, kDword1));
   scoped_ptr<SetRegValueWorkItem> work_item3(
       WorkItem::CreateSetRegValueWorkItem(HKEY_CURRENT_USER,
                                           kTestKey,
                                           WorkItem::kWow64Default,
                                           kNameDword,
                                           kDword2,
@@ skipping 145 matching lines @@
 
   work_item->Rollback();
 
   DWORD read_dword_out = 0;
   EXPECT_TRUE(test_key_.HasValue(kNameStr));
   EXPECT_EQ(ERROR_SUCCESS, test_key_.ReadValueDW(kNameStr, &read_dword_out));
   EXPECT_EQ(read_dword_out, kDword1);
 
   EXPECT_EQ(1, callback_invocation_count);
 }