Refactor code to avoid direct dependency upon ICU: phishing_term_feature_extractor

base/i18n/break_iterator.h

Index: base/i18n/break_iterator.h
diff --git a/base/i18n/break_iterator.h b/base/i18n/break_iterator.h
index 618a320924e4993e4d76ee818462c6512b8bcc37..83f85571609ba70fda9963c71abdf67cdd7223ee 100644
--- a/base/i18n/break_iterator.h
+++ b/base/i18n/break_iterator.h
@@ -106,6 +106,11 @@ class BASE_I18N_EXPORT BreakIterator {
   // or BreakIterator::npos when done.
   size_t pos() const { return pos_; }
 
+  // Returns whether or not the iterator is currently at a valid position.
+  bool IsValid() const {
+    return pos_ != static_cast<size_t>(-1);
+  }
+
  private:
   // ICU iterator, avoiding ICU ubrk.h dependence.
   // This is actually an ICU UBreakiterator* type, which turns out to be