Remove OS(IOS) and OS(MAC_OS_X) guards.

Source/core/page/Settings.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2011, 2012 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 66 matching lines @@
         return it->value;
     if (script != USCRIPT_COMMON)
         return getGenericFontFamilyForScript(fontMap, USCRIPT_COMMON);
     return emptyAtom;
 }
 
 bool Settings::gMockScrollbarsEnabled = false;
 bool Settings::gUsesOverlayScrollbars = false;
 
 // NOTEs
-//  1) EditingMacBehavior comprises Tiger, Leopard, SnowLeopard and iOS builds, as well QtWebKit and Chromium when built on Mac;
-//  2) EditingWindowsBehavior comprises Win32 and WinCE builds, as well as QtWebKit and Chromium when built on Windows;
+//  1) EditingMacBehavior comprises builds on Mac;
+//  2) EditingWindowsBehavior comprises builds on Windows;
 //  3) EditingUnixBehavior comprises all unix-based systems, but Darwin/MacOS/Android (and then abusing the terminology);
 //  4) EditingAndroidBehavior comprises Android builds.
 // 99) MacEditingBehavior is used a fallback.
 static EditingBehaviorType editingBehaviorTypeForPlatform()
 {
     return
 #if OS(DARWIN)
     EditingMacBehavior
 #elif OS(WINDOWS)
     EditingWindowsBehavior
 #elif OS(ANDROID)
     EditingAndroidBehavior
 #elif OS(UNIX)
     EditingUnixBehavior
 #else
     // Fallback
     EditingMacBehavior
 #endif
     ;
 }
 
 #if USE(UNIFIED_TEXT_CHECKING)
 static const bool defaultUnifiedTextCheckerEnabled = true;
 #else
 static const bool defaultUnifiedTextCheckerEnabled = false;
 #endif
-#if OS(MAC_OS_X)
+#if OS(DARWIN)
 static const bool defaultSmartInsertDeleteEnabled = true;
 #else
 static const bool defaultSmartInsertDeleteEnabled = false;
 #endif
 #if OS(WINDOWS)
 static const bool defaultSelectTrailingWhitespaceEnabled = true;
 #else
 static const bool defaultSelectTrailingWhitespaceEnabled = false;
 #endif
 
@@ skipping 253 matching lines @@
 {
     gUsesOverlayScrollbars = flag;
 }
 
 bool Settings::usesOverlayScrollbars()
 {
     return gUsesOverlayScrollbars;
 }
 
 } // namespace WebCore