Delete the Layer Squashing runtime feature.

Source/core/testing/InternalSettings.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 76 matching lines @@
     settings->setEditingBehaviorType(m_originalEditingBehavior);
     settings->setTextAutosizingEnabled(m_originalTextAutosizingEnabled);
     settings->setTextAutosizingWindowSizeOverride(m_originalTextAutosizingWindowSizeOverride);
     settings->setAccessibilityFontScaleFactor(m_originalAccessibilityFontScaleFactor);
     settings->setMediaTypeOverride(m_originalMediaTypeOverride);
     settings->setMockScrollbarsEnabled(m_originalMockScrollbarsEnabled);
     settings->setMockGestureTapHighlightsEnabled(m_originalMockGestureTapHighlightsEnabled);
     RuntimeEnabledFeatures::setLangAttributeAwareFormControlUIEnabled(m_langAttributeAwareFormControlUIEnabled);
     settings->setImagesEnabled(m_imagesEnabled);
     settings->setDefaultVideoPosterURL(m_defaultVideoPosterURL);
-    settings->setLayerSquashingEnabled(m_originalLayerSquashingEnabled);
     settings->genericFontFamilySettings().reset();
     RuntimeEnabledFeatures::setPseudoClassesInMatchingCriteriaInAuthorShadowTreesEnabled(m_originalPseudoClassesInMatchingCriteriaInAuthorShadowTreesEnabled);
     RuntimeEnabledFeatures::setImageColorProfilesEnabled(m_originalImageColorProfilesEnabled);
 }
 
 #if ENABLE(OILPAN)
 InternalSettings* InternalSettings::from(Page& page)
 {
     if (!HeapSupplement<Page>::from(page, supplementName()))
         HeapSupplement<Page>::provideTo(page, supplementName(), new InternalSettings(page));
@@ skipping 100 matching lines @@
 {
     RuntimeEnabledFeatures::setOverlayScrollbarsEnabled(enabled);
 }
 
 void InternalSettings::setViewportEnabled(bool enabled, ExceptionState& exceptionState)
 {
     InternalSettingsGuardForSettings();
     settings()->setViewportEnabled(enabled);
 }
 
-// FIXME: This is a temporary flag and should be removed once squashing is
-// ready (crbug.com/261605).
-void InternalSettings::setLayerSquashingEnabled(bool enabled, ExceptionState& exceptionState)
-{
-    InternalSettingsGuardForSettings();
-    settings()->setLayerSquashingEnabled(enabled);
-}
-
 void InternalSettings::setStandardFontFamily(const AtomicString& family, const String& script, ExceptionState& exceptionState)
 {
     InternalSettingsGuardForSettings();
     UScriptCode code = scriptNameToCode(script);
     if (code == USCRIPT_INVALID_CODE)
         return;
     if (settings()->genericFontFamilySettings().updateStandard(family, code))
         settings()->notifyGenericFontFamilyChange();
 }
 
@@ skipping 205 matching lines @@
         hoverType = HoverTypeOnDemand;
     else if (token == "hover")
         hoverType = HoverTypeHover;
     else
         exceptionState.throwDOMException(SyntaxError, "The hover type token ('" + token + ")' is invalid.");
 
     settings()->setPrimaryHoverType(hoverType);
 }
 
 }