Use GetDisplayText() instead of text() for rendering text.

ui/gfx/render_text_harfbuzz.cc

Index: ui/gfx/render_text_harfbuzz.cc
diff --git a/ui/gfx/render_text_harfbuzz.cc b/ui/gfx/render_text_harfbuzz.cc
index 0580abe3375e09bddae437c08a958ee6a7d16977..72caa5901788843c2b31fe04476abb553e6c4622 100644
--- a/ui/gfx/render_text_harfbuzz.cc
+++ b/ui/gfx/render_text_harfbuzz.cc
@@ -1453,17 +1453,6 @@ base::i18n::BreakIterator* RenderTextHarfBuzz::GetGraphemeIterator() {
   return grapheme_iterator_.get();
 }
 
-size_t RenderTextHarfBuzz::TextIndexToGivenTextIndex(
-    const base::string16& given_text,
-    size_t index) {
-  DCHECK(given_text == layout_text() || given_text == display_text());
-  DCHECK_LE(index, text().length());
-  ptrdiff_t i = obscured() ? UTF16IndexToOffset(text(), 0, index) : index;
-  CHECK_GE(i, 0);
-  // Clamp indices to the length of the given layout or display text.
-  return std::min<size_t>(given_text.length(), i);
-}
-
 internal::TextRunList* RenderTextHarfBuzz::GetRunList() {
   DCHECK(!update_layout_run_list_);
   DCHECK(!update_display_run_list_);