Remove Chromium plumbing for fixed-position-creates-stacking-context.

content/renderer/web_preferences.cc

 // Copyright 2013 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/public/renderer/web_preferences.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 #include "third_party/WebKit/public/platform/WebURL.h"
 #include "third_party/WebKit/public/web/WebKit.h"
@@ skipping 245 matching lines @@
 
   settings->setRegionBasedColumnsEnabled(prefs.region_based_columns_enabled);
 
   WebRuntimeFeatures::enableLazyLayout(prefs.lazy_layout_enabled);
   WebRuntimeFeatures::enableTouch(prefs.touch_enabled);
   settings->setMaxTouchPoints(prefs.pointer_events_max_touch_points);
   settings->setDeviceSupportsTouch(prefs.device_supports_touch);
   settings->setDeviceSupportsMouse(prefs.device_supports_mouse);
   settings->setEnableTouchAdjustment(prefs.touch_adjustment_enabled);
 
-  settings->setFixedPositionCreatesStackingContext(
-      prefs.fixed_position_creates_stacking_context);
-
   settings->setDeferredImageDecodingEnabled(
       prefs.deferred_image_decoding_enabled);
   settings->setShouldRespectImageOrientation(
       prefs.should_respect_image_orientation);
 
   settings->setUnsafePluginPastingEnabled(false);
   settings->setEditingBehavior(
       static_cast<WebSettings::EditingBehavior>(prefs.editing_behavior));
 
   settings->setSupportsMultipleWindows(prefs.supports_multiple_windows);
@@ skipping 52 matching lines @@
   settings->setPinchVirtualViewportEnabled(
       prefs.pinch_virtual_viewport_enabled);
 
   settings->setPinchOverlayScrollbarThickness(
       prefs.pinch_overlay_scrollbar_thickness);
   settings->setUseSolidColorScrollbars(prefs.use_solid_color_scrollbars);
   settings->setCompositorTouchHitTesting(prefs.compositor_touch_hit_testing);
 }
 
 }  // namespace content