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

ui/native_theme/native_theme_aura.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/native_theme/native_theme_aura.h"
 
 #include <limits>
 
 #include "base/logging.h"
 #include "ui/base/layout.h"
@@ skipping 52 matching lines @@
 
 const int kScrollbarOverlayThumbFillImages[9] =
     IMAGE_GRID(IDR_SCROLLBAR_OVERLAY_THUMB_FILL);
 
 const int kScrollbarTrackImages[9] = IMAGE_GRID(IDR_SCROLLBAR_BASE);
 
 }  // namespace
 
 #if !defined(OS_WIN)
 // static
-NativeTheme* NativeTheme::instance() {
+NativeTheme* NativeTheme::GetInstanceForWeb() {
   return NativeThemeAura::instance();
 }
 
 // static
 NativeThemeAura* NativeThemeAura::instance() {
   CR_DEFINE_STATIC_LOCAL(NativeThemeAura, s_native_theme, ());
   return &s_native_theme;
 }
 #endif
 
@@ skipping 530 matching lines @@
     scoped_ptr<NineImagePainter> stroke_painter,
     const uint8 stroke_alphas[kNumStates])
     : fill_painter(fill_painter.Pass()),
       fill_alphas(fill_alphas),
       stroke_painter(stroke_painter.Pass()),
       stroke_alphas(stroke_alphas) {}
 
 NativeThemeAura::DualPainter::~DualPainter() {}
 
 }  // namespace ui