Remove ThemeColor runtime feature

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 4690 matching lines @@
         iconURLs.append(firstTouchIcon);
     if (firstTouchPrecomposedIcon.m_iconType != InvalidIcon)
         iconURLs.append(firstTouchPrecomposedIcon);
     for (int i = secondaryIcons.size() - 1; i >= 0; --i)
         iconURLs.append(secondaryIcons[i]);
     return iconURLs;
 }
 
 Color Document::themeColor() const
 {
-    if (!RuntimeEnabledFeatures::themeColorEnabled())
-        return Color();
-
     for (HTMLMetaElement* metaElement = head() ? Traversal<HTMLMetaElement>::firstChild(*head()) : 0; metaElement; metaElement = Traversal<HTMLMetaElement>::nextSibling(*metaElement)) {
         RGBA32 rgb = Color::transparent;
         if (equalIgnoringCase(metaElement->name(), "theme-color") && CSSParser::parseColor(rgb, metaElement->content().string().stripWhiteSpace(), true))
             return Color(rgb);
     }
     return Color();
 }
 
 HTMLLinkElement* Document::linkManifest() const
 {
@@ skipping 1093 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