Remove inheritance of designMode attribute.

Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 425 matching lines @@
     , m_ignoreDestructiveWriteCount(0)
     , m_markers(adoptPtrWillBeNoop(new DocumentMarkerController))
     , m_updateFocusAppearanceTimer(this, &Document::updateFocusAppearanceTimerFired)
     , m_cssTarget(nullptr)
     , m_loadEventProgress(LoadEventNotRun)
     , m_startTime(currentTime())
     , m_scriptRunner(ScriptRunner::create(this))
     , m_xmlVersion("1.0")
     , m_xmlStandalone(StandaloneUnspecified)
     , m_hasXMLDeclaration(0)
-    , m_designMode(inherit)
+    , m_designMode(false)
     , m_hasAnnotatedRegions(false)
     , m_annotatedRegionsDirty(false)
     , m_useSecureKeyboardEntryWhenActive(false)
     , m_documentClasses(documentClasses)
     , m_isViewSource(false)
     , m_sawElementsInKnownNamespaces(false)
     , m_isSrcdocDocument(false)
     , m_isMobileDocument(false)
     , m_isTransitionDocument(false)
     , m_layoutView(0)
@@ skipping 3860 matching lines @@
 {
     ASSERT(!m_currentScriptStack.isEmpty());
     m_currentScriptStack.removeLast();
 }
 
 void Document::setTransformSource(PassOwnPtr<TransformSource> source)
 {
     m_transformSource = source;
 }
 
-void Document::setDesignMode(InheritedBool value)
-{
-    m_designMode = value;
-    for (Frame* frame = m_frame; frame; frame = frame->tree().traverseNext(m_frame)) {
-        if (!frame->isLocalFrame())
-            continue;
-        if (!toLocalFrame(frame)->document())
-            break;
-        toLocalFrame(frame)->document()->setNeedsStyleRecalc(SubtreeStyleChange, StyleChangeReasonForTracing::create(StyleChangeReason::DesignMode));
-    }
-}
-
-bool Document::inDesignMode() const
-{
-    for (const Document* d = this; d; d = d->parentDocument()) {
-        if (d->m_designMode != inherit)
-            return d->m_designMode;
-    }
-    return false;
-}
-
 String Document::designMode() const
 {
     return inDesignMode() ? "on" : "off";
 }
 
 void Document::setDesignMode(const String& value)
 {
-    InheritedBool mode;
+    bool newValue = m_designMode;
     if (equalIgnoringCase(value, "on"))
-        mode = on;
+        newValue = true;
     else if (equalIgnoringCase(value, "off"))
-        mode = off;
-    else
-        mode = inherit;
-    setDesignMode(mode);
+        newValue = false;
+    if (newValue == m_designMode)
+        return;
+    m_designMode = newValue;
+    setNeedsStyleRecalc(SubtreeStyleChange, StyleChangeReasonForTracing::create(StyleChangeReason::DesignMode));
 }
 
 Document* Document::parentDocument() const
 {
     if (!m_frame)
         return 0;
     Frame* parent = m_frame->tree().parent();
     if (!parent || !parent->isLocalFrame())
         return 0;
     return toLocalFrame(parent)->document();
@@ skipping 1378 matching lines @@
 #ifndef NDEBUG
 using namespace blink;
 void showLiveDocumentInstances()
 {
     WeakDocumentSet& set = liveDocumentSet();
     fprintf(stderr, "There are %u documents currently alive:\n", set.size());
     for (Document* document : set)
         fprintf(stderr, "- Document %p URL: %s\n", document, document->url().string().utf8().data());
 }
 #endif