Fix Views inline autocomplete with multi-char graphemes.

ui/views/controls/textfield/textfield.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/controls/textfield/textfield.h"
 
 #include <string>
 
 #include "base/debug/trace_event.h"
 #include "grit/ui_strings.h"
@@ skipping 1307 matching lines @@
   DCHECK(rect);
   if (!HasCompositionText())
     return false;
   gfx::RenderText* render_text = GetRenderText();
   const gfx::Range& composition_range = render_text->GetCompositionRange();
   DCHECK(!composition_range.is_empty());
 
   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);
   }
   if (text_index < composition_range.start())
     return false;
   const gfx::SelectionModel caret(text_index, gfx::CURSOR_BACKWARD);
   *rect = render_text->GetCursorBounds(caret, false);
   ConvertRectToScreen(this, rect);
   return true;
 }
@@ skipping 341 matching lines @@
       const size_t length = selection_clipboard_text.length();
       range = gfx::Range(range.start() + length, range.end() + length);
     }
     model_->MoveCursorTo(gfx::SelectionModel(range, affinity));
     UpdateAfterChange(true, true);
     OnAfterUserAction();
   }
 }
 
 }  // namespace views