Port autocomplete_edit_view_browsertest.cc to Mac.

chrome/browser/autocomplete/autocomplete_edit_view_gtk.cc

 // Copyright (c) 2011 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 "chrome/browser/autocomplete/autocomplete_edit_view_gtk.h"
 
 #include <gdk/gdkkeysyms.h>
 #include <gtk/gtk.h>
 
 #include <algorithm>
@@ skipping 1734 matching lines @@
 
     // Stop propagating the signal.
     static guint copy_signal_id =
         g_signal_lookup("copy-clipboard", GTK_TYPE_TEXT_VIEW);
     static guint cut_signal_id =
         g_signal_lookup("cut-clipboard", GTK_TYPE_TEXT_VIEW);
     g_signal_stop_emission(text_view_,
                            copy ? copy_signal_id : cut_signal_id,
                            0);
 
-    if (!copy)
+    if (!copy && gtk_text_view_get_editable(GTK_TEXT_VIEW(text_view_)))
       gtk_text_buffer_delete_selection(text_buffer_, true, true);
   }
 
   OwnPrimarySelection(UTF16ToUTF8(text));
 }
 
 bool AutocompleteEditViewGtk::OnPerformDropImpl(const string16& text) {
   if (model_->CanPasteAndGo(CollapseWhitespace(text, true))) {
     model_->PasteAndGo();
     return true;
@@ skipping 556 matching lines @@
   // baseline, so we need to move the |instant_view_| down to make sure it
   // has the same baseline as the |text_view_|.
   PangoLayout* layout = gtk_label_get_layout(GTK_LABEL(instant_view_));
   int height;
   pango_layout_get_size(layout, NULL, &height);
   PangoLayoutIter* iter = pango_layout_get_iter(layout);
   int baseline = pango_layout_iter_get_baseline(iter);
   pango_layout_iter_free(iter);
   g_object_set(instant_anchor_tag_, "rise", baseline - height, NULL);
 }