Fix Views inline autocomplete with multi-char graphemes.

ui/views/controls/textfield/textfield.cc

Index: ui/views/controls/textfield/textfield.cc
diff --git a/ui/views/controls/textfield/textfield.cc b/ui/views/controls/textfield/textfield.cc
index c46ddd24b6d8b7bc5236e7e5fd83758772cb13ed..8645ace57eb8e73c5db77feec6b90394d3597cfb 100644
--- a/ui/views/controls/textfield/textfield.cc
+++ b/ui/views/controls/textfield/textfield.cc
@@ -1325,7 +1325,7 @@ bool Textfield::GetCompositionCharacterBounds(uint32 index,
   size_t text_index = composition_range.start() + index;
   if (composition_range.end() <= text_index)
     return false;
-  if (!render_text->IsCursorablePosition(text_index)) {
+  if (!render_text->IsValidCursorIndex(text_index)) {
     text_index = render_text->IndexOfAdjacentGrapheme(
         text_index, gfx::CURSOR_BACKWARD);
   }