Update ICU to 58.1

source/common/unicode/brkiter.h

Index: source/common/unicode/brkiter.h
diff --git a/source/common/unicode/brkiter.h b/source/common/unicode/brkiter.h
index 4aa5e552796090eaebcd7ce7b7d275aa8b3775b4..88b39c6699b2f63b997f010cbafce9a02f6a37fa 100644
--- a/source/common/unicode/brkiter.h
+++ b/source/common/unicode/brkiter.h
@@ -1,6 +1,8 @@
+// Copyright (C) 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
 /*
 ********************************************************************************
-*   Copyright (C) 1997-2014, International Business Machines
+*   Copyright (C) 1997-2016, International Business Machines
 *   Corporation and others.  All Rights Reserved.
 ********************************************************************************
 *
@@ -168,6 +170,11 @@ public:
     /**
      * Change the text over which this operates. The text boundary is
      * reset to the start.
+     *
+     * The BreakIterator will retain a reference to the supplied string.
+     * The caller must not modify or delete the text while the BreakIterator
+     * retains the reference.
+     *
      * @param text The UnicodeString used to change the text.
      * @stable ICU 2.0
      */
@@ -291,7 +298,7 @@ public:
     virtual int32_t next(int32_t n) = 0;
 
    /**
-     * For RuleBasedBreakIterators, return the status tag from the 
+     * For RuleBasedBreakIterators, return the status tag from the
      * break rule that determined the most recently
      * returned break position.
      * <p>
@@ -307,7 +314,7 @@ public:
     virtual int32_t getRuleStatus() const;
 
    /**
-    * For RuleBasedBreakIterators, get the status (tag) values from the break rule(s) 
+    * For RuleBasedBreakIterators, get the status (tag) values from the break rule(s)
     * that determined the most recently returned break position.
     * <p>
     * For break iterator types that do not support rule status,
@@ -623,8 +630,11 @@ protected:
     BreakIterator();
     /** @internal */
     BreakIterator (const BreakIterator &other) : UObject(other) {}
+#ifndef U_HIDE_INTERNAL_API
     /** @internal */
     BreakIterator (const Locale& valid, const Locale& actual);
+#endif  /* U_HIDE_INTERNAL_API */
+
 private:
 
     /** @internal */