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

chrome/installer/util/self_cleaning_temp_dir_unittest.cc

 // 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.
 
 #include <windows.h>
 #include <wincrypt.h>
 
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 10 matching lines @@
 
   // Get four bytes of randomness.  Use CAPI rather than the CRT since I've
   // seen the latter trivially repeat.
   EXPECT_NE(FALSE, CryptAcquireContext(&crypt_ctx, NULL, NULL, PROV_RSA_FULL,
                                         CRYPT_VERIFYCONTEXT));
   EXPECT_NE(FALSE, CryptGenRandom(crypt_ctx, arraysize(data), &data[0]));
   EXPECT_NE(FALSE, CryptReleaseContext(crypt_ctx, 0));
 
   // Hexify the value.
   std::string result(base::HexEncode(&data[0], arraysize(data)));
-  EXPECT_EQ(8, result.size());
+  EXPECT_EQ(8u, result.size());
 
   // Replace the first digit with the letter 'R' (for "random", get it?).
   result[0] = 'R';
 
   return result;
 }
 
 }  // namespace
 
 namespace installer {
@@ skipping 110 matching lines @@
   EXPECT_TRUE(work_dir.CreateUniqueTempDir());
 
   // Make up some path under the temp dir.
   base::FilePath parent_temp_dir(work_dir.path().Append(L"One").Append(L"Two"));
   {
     SelfCleaningTempDir temp_dir;
     EXPECT_TRUE(temp_dir.Initialize(parent_temp_dir, L"Three"));
     EXPECT_EQ(parent_temp_dir.Append(L"Three"), temp_dir.path());
     EXPECT_TRUE(base::DirectoryExists(temp_dir.path()));
     // Drop a file somewhere.
-    EXPECT_EQ(arraysize(kHiHon) - 1,
+    EXPECT_EQ(static_cast<int>(arraysize(kHiHon) - 1),
               base::WriteFile(parent_temp_dir.AppendASCII(GetRandomFilename()),
                               kHiHon, arraysize(kHiHon) - 1));
   }
   EXPECT_FALSE(base::DirectoryExists(parent_temp_dir.Append(L"Three")));
   EXPECT_TRUE(base::DirectoryExists(parent_temp_dir));
   EXPECT_TRUE(work_dir.Delete());
   EXPECT_FALSE(base::DirectoryExists(parent_temp_dir.DirName().DirName()));
 }
 
 }  // namespace installer