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

ui/gfx/icon_util_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 "ui/gfx/icon_util.h"
 
 #include <vector>
 
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
@@ skipping 399 matching lines @@
   HMODULE module = GetModuleHandle(NULL);
   scoped_ptr<gfx::ImageFamily> family(
       IconUtil::CreateImageFamilyFromIconResource(module, IDR_MAINFRAME));
   ASSERT_TRUE(family.get());
   EXPECT_FALSE(family->empty());
   std::vector<gfx::Image> images;
   for (const auto& image : *family)
     images.push_back(image);
 
   // Assert that the family contains all of the images from the icon resource.
-  EXPECT_EQ(5, images.size());
+  EXPECT_EQ(5u, images.size());
   EXPECT_EQ(16, images[0].Width());
   EXPECT_EQ(24, images[1].Width());
   EXPECT_EQ(32, images[2].Width());
   EXPECT_EQ(48, images[3].Width());
   EXPECT_EQ(256, images[4].Width());
 }
 
 // This tests that kNumIconDimensionsUpToMediumSize has the correct value.
 TEST_F(IconUtilTest, TestNumIconDimensionsUpToMediumSize) {
   ASSERT_LE(IconUtil::kNumIconDimensionsUpToMediumSize,
             IconUtil::kNumIconDimensions);
   EXPECT_EQ(IconUtil::kMediumIconSize,
             IconUtil::kIconDimensions[
                 IconUtil::kNumIconDimensionsUpToMediumSize - 1]);
 }