Fix scrollbar buttons at hidpi when enable-use-zoom-for-dsf is on.

content/renderer/render_view_impl.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 "content/renderer/render_view_impl.h"
 
 #include <algorithm>
 #include <cmath>
 #include <memory>
 
@@ skipping 2568 matching lines @@
   disable_scrollbars_size_limit_ = disable_scrollbar_size_limit;
 }
 
 void RenderViewImpl::OnSetRendererPrefs(
     const RendererPreferences& renderer_prefs) {
   std::string old_accept_languages = renderer_preferences_.accept_languages;
 
   renderer_preferences_ = renderer_prefs;
 
   UpdateFontRenderingFromRendererPrefs();
-  UpdateThemePrefs();
 
 #if defined(USE_DEFAULT_RENDER_THEME)
   if (renderer_prefs.use_custom_colors) {
     blink::setFocusRingColor(renderer_prefs.focus_ring_color);
     blink::setCaretBlinkInterval(renderer_prefs.caret_blink_interval);
 
     if (webview()) {
       webview()->setSelectionColors(
           renderer_prefs.active_selection_bg_color,
           renderer_prefs.active_selection_fg_color,
@@ skipping 786 matching lines @@
         return render_frame->focused_pepper_plugin();
     }
     frame = frame->traverseNext(false);
   }
 
   return nullptr;
 }
 #endif
 
 }  // namespace content