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

ui/gfx/range/range_win_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 "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/range/range.h"
 
 TEST(RangeTest, FromCHARRANGE) {
   CHARRANGE cr = { 10, 32 };
   gfx::Range r(cr, 50);
@@ skipping 27 matching lines @@
 TEST(RangeTest, ToCHARRANGE) {
   gfx::Range r(10, 30);
   CHARRANGE cr = r.ToCHARRANGE();
   EXPECT_EQ(10, cr.cpMin);
   EXPECT_EQ(30, cr.cpMax);
 }
 
 TEST(RangeTest, ReversedToCHARRANGE) {
   gfx::Range r(20, 10);
   CHARRANGE cr = r.ToCHARRANGE();
-  EXPECT_EQ(20U, cr.cpMin);
-  EXPECT_EQ(10U, cr.cpMax);
+  EXPECT_EQ(20, cr.cpMin);
+  EXPECT_EQ(10, cr.cpMax);
 }
 
 TEST(RangeTest, FromCHARRANGEInvalid) {
   CHARRANGE cr = { -1, -1 };
   gfx::Range r(cr, 30);
   EXPECT_FALSE(r.IsValid());
 }
 
 TEST(RangeTest, ToCHARRANGEInvalid) {
   gfx::Range r(gfx::Range::InvalidRange());
   CHARRANGE cr = r.ToCHARRANGE();
   EXPECT_EQ(-1, cr.cpMin);
   EXPECT_EQ(-1, cr.cpMax);
 }