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

printing/printing_context_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 "printing/printing_context_win.h"
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
 #include "base/win/scoped_handle.h"
 #include "base/win/scoped_hdc.h"
@@ skipping 134 matching lines @@
 
   MockPrintingContextWin context(this);
   context.AskUserForSettings(
       123,
       false,
       false,
       base::Bind(&PrintingContextTest::PrintSettingsCallback,
                  base::Unretained(this)));
   EXPECT_EQ(PrintingContext::OK, result());
   PrintSettings settings = context.settings();
-  EXPECT_EQ(settings.ranges().size(), 0);
+  EXPECT_EQ(0u, settings.ranges().size());
 }
 
 TEST_F(PrintingContextTest, Base) {
   if (IsTestCaseDisabled())
     return;
 
   PrintSettings settings;
   settings.set_device_name(GetDefaultPrinter());
   // Initialize it.
   scoped_ptr<PrintingContext> context(PrintingContext::Create(this));
   EXPECT_EQ(PrintingContext::OK, context->InitWithSettings(settings));
 
   // The print may lie to use and may not support world transformation.
   // Verify right now.
   XFORM random_matrix = { 1, 0.1f, 0, 1.5f, 0, 1 };
   EXPECT_TRUE(SetWorldTransform(context->context(), &random_matrix));
   EXPECT_TRUE(ModifyWorldTransform(context->context(), NULL, MWT_IDENTITY));
 }
 
 }  // namespace printing