win: Fix a few minor issues found by clang.

ui/gfx/platform_font_win.cc

 // Copyright (c) 2012 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/platform_font_win.h"
 
 #include <windows.h>
 #include <math.h>
 
 #include <algorithm>
@@ skipping 204 matching lines @@
     base_font_ref_->AddRef();
   }
   return base_font_ref_;
 }
 
 PlatformFontWin::HFontRef* PlatformFontWin::CreateHFontRef(HFONT font) {
   TEXTMETRIC font_metrics;
 
   {
     base::win::ScopedGetDC screen_dc(NULL);
-    base::win::ScopedSelectObject font(screen_dc, font);
+    base::win::ScopedSelectObject scoped_font(screen_dc, font);
     ui::ScopedSetMapMode mode(screen_dc, MM_TEXT);
     GetTextMetrics(screen_dc, &font_metrics);
   }
 
   const int height = std::max<int>(1, font_metrics.tmHeight);
   const int baseline = std::max<int>(1, font_metrics.tmAscent);
   const int ave_char_width = std::max<int>(1, font_metrics.tmAveCharWidth);
   const int font_size =
       std::max<int>(1, font_metrics.tmHeight - font_metrics.tmInternalLeading);
   int style = 0;
@@ skipping 73 matching lines @@
   return new PlatformFontWin(native_font);
 }
 
 // static
 PlatformFont* PlatformFont::CreateFromNameAndSize(const std::string& font_name,
                                                   int font_size) {
   return new PlatformFontWin(font_name, font_size);
 }
 
 }  // namespace gfx