Include AvailabilityMacros.h only where it is used.

Source/core/platform/text/cf/HyphenationCF.cpp

 /*
  * Copyright (C) 2010 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
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  * THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/platform/text/Hyphenation.h"
+#include <AvailabilityMacros.h>
 
 #if __MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
 
 #include "core/platform/text/AtomicStringKeyedMRUCache.h"
 #include "core/platform/text/TextBreakIteratorInternalICU.h"
 #include <wtf/ListHashSet.h>
 #include <wtf/RetainPtr.h>
 
 namespace WebCore {
 
@@ skipping 32 matching lines @@
     ASSERT(locale);
 
     CFOptionFlags searchAcrossWordBoundaries = 1;
     CFIndex result = CFStringGetHyphenationLocationBeforeIndex(string.get(), beforeIndex, CFRangeMake(0, length), searchAcrossWordBoundaries, locale.get(), 0);
     return result == kCFNotFound ? 0 : result;
 }
 
 } // namespace WebCore
 
 #endif // __MAC_OS_X_VERSION_MIN_REQUIRED >= 1070