Change name of NativeTheme::instance() to make it clear it's web only.

ui/native_theme/native_theme_aurawin.cc

 // Copyright 2014 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/native_theme/native_theme_aurawin.h"
 
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "ui/native_theme/common_theme.h"
 #include "ui/native_theme/native_theme_win.h"
 
@@ skipping 16 matching lines @@
     case NativeTheme::kScrollbarCorner:
       return true;
     default:
       return false;
   }
 }
 
 }  // namespace
 
 // static
-NativeTheme* NativeTheme::instance() {
+NativeTheme* NativeTheme::GetInstanceForWeb() {
   return NativeThemeAuraWin::instance();
 }
 
 // static
 NativeThemeAura* NativeThemeAura::instance() {
   return NativeThemeAuraWin::instance();
 }
 
 // static
 NativeThemeAuraWin* NativeThemeAuraWin::instance() {
@@ skipping 30 matching lines @@
 
   // We want aura on windows to use the same size for scrollbars as we would in
   // the native theme.
   if (IsScrollbarPart(part))
     return NativeThemeWin::instance()->GetPartSize(part, state, extra);
 
   return NativeThemeAura::GetPartSize(part, state, extra);
 }
 
 }  // namespace ui