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 2467 matching lines @@
 }
 
 void RenderViewImpl::OnSetRendererPrefs(
     const RendererPreferences& renderer_prefs) {
   double old_zoom_level = renderer_preferences_.default_zoom_level;
   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 801 matching lines @@
   if (IsUseZoomForDSFEnabled()) {
     webview()->setZoomFactorForDeviceScaleFactor(device_scale_factor_);
   } else {
     webview()->setDeviceScaleFactor(device_scale_factor_);
   }
   webview()->settings()->setPreferCompositingToLCDTextEnabled(
       PreferCompositingToLCDText(compositor_deps_, device_scale_factor_));
 }
 
 }  // namespace content