TextBreakIterator should use the C++ icu API instead of the C one

Source/platform/text/TextBoundaries.cpp

 /*
  * Copyright (C) 2006, 2007 Apple Inc.  All rights reserved.
  * Copyright (C) 2009 Dominik Röttsches <dominik.roettsches@access-company.com>
  *
  * 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
@@ skipping 47 matching lines @@
             return last;
     }
     return 0;
 }
 
 int findNextWordFromIndex(const UChar* chars, int len, int position, bool forward)
 {
     TextBreakIterator* it = wordBreakIterator(chars, len);
 
     if (forward) {
-        position = textBreakFollowing(it, position);
+        position = it->following(position);
         while (position != TextBreakDone) {
             // We stop searching when the character preceeding the break
             // is alphanumeric.
             if (position < len && isAlphanumeric(chars[position - 1]))
                 return position;
 
-            position = textBreakFollowing(it, position);
+            position = it->following(position);
         }
 
         return len;
     } else {
-        position = textBreakPreceding(it, position);
+        position = it->preceding(position);
         while (position != TextBreakDone) {
             // We stop searching when the character following the break
             // is alphanumeric.
             if (position > 0 && isAlphanumeric(chars[position]))
                 return position;
 
-            position = textBreakPreceding(it, position);
+            position = it->preceding(position);
         }
 
         return 0;
     }
 }
 
 void findWordBoundary(const UChar* chars, int len, int position, int* start, int* end)
 {
     TextBreakIterator* it = wordBreakIterator(chars, len);
-    *end = textBreakFollowing(it, position);
+    *end = it->following(position);
     if (*end < 0)
-        *end = textBreakLast(it);
-    *start = textBreakPrevious(it);
+        *end = it->last();
+    *start = it->previous();
 }
 
 
 } // namespace WebCore