untangle pango usage from use_x11 and OS==linux

content/common/font_list_linux.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 "content/common/font_list.h"
-
-#include <pango/pango.h>
-#include <pango/pangocairo.h>
-
-#include <set>
-#include <string>
-
-#include "base/values.h"
-
-namespace content {
-
-scoped_ptr<base::ListValue> GetFontList_SlowBlocking() {
-  scoped_ptr<base::ListValue> font_list(new base::ListValue);
-
-  PangoFontMap* font_map = ::pango_cairo_font_map_get_default();
-  PangoFontFamily** families = NULL;
-  int num_families = 0;
-  ::pango_font_map_list_families(font_map, &families, &num_families);
-
-  std::set<std::string> sorted_families;
-  for (int i = 0; i < num_families; i++) {
-    sorted_families.insert(::pango_font_family_get_name(families[i]));
-  }
-  g_free(families);
-
-  for (std::set<std::string>::const_iterator iter = sorted_families.begin();
-       iter != sorted_families.end(); ++iter) {
-    base::ListValue* font_item = new base::ListValue();
-    font_item->Append(new base::StringValue(*iter));
-    font_item->Append(new base::StringValue(*iter));  // localized name.
-    // TODO(yusukes): Support localized family names.
-    font_list->Append(font_item);
-  }
-
-  return font_list.Pass();
-}
-
-}  // namespace content