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

chrome/browser/safe_browsing/incident_reporting/blacklist_load_analyzer_win_unittest.cc

 // Copyright 2014 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 "chrome/browser/safe_browsing/incident_reporting/blacklist_load_analyzer.h"
 
 #include <vector>
 
 #include "base/files/file_path.h"
 #include "base/path_service.h"
@@ skipping 24 matching lines @@
   for (; module_iter != module_names.end(); ++module_iter) {
     LOG(ERROR) << "Found blacklisted module: " << *module_iter;
   }
 
   // Add test dll to blacklist
   blacklist::AddDllToBlacklist(kTestDllName);
 
   // Check that the test dll appears in list.
   module_names.clear();
   EXPECT_TRUE(GetLoadedBlacklistedModules(&module_names));
-  ASSERT_EQ(1, module_names.size());
+  ASSERT_EQ(1u, module_names.size());
   EXPECT_STREQ(kTestDllName,
                base::ToLowerASCII(
                    base::FilePath(module_names[0]).BaseName().value()).c_str());
 }
 
 }  // namespace safe_browsing