linux: Both gtk and the aura port should set the icon theme name.

chrome/browser/ui/libgtk2ui/gtk2_ui.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 "chrome/browser/ui/libgtk2ui/gtk2_ui.h"
 
 #include <set>
 
 #include "base/command_line.h"
 #include "base/i18n/rtl.h"
 #include "base/logging.h"
+#include "base/nix/mime_util_xdg.h"
 #include "base/stl_util.h"
 #include "chrome/browser/themes/theme_service.h"
 #include "chrome/browser/ui/libgtk2ui/chrome_gtk_frame.h"
 #include "chrome/browser/ui/libgtk2ui/gtk2_util.h"
 #include "chrome/browser/ui/libgtk2ui/select_file_dialog_impl.h"
 #include "chrome/browser/ui/libgtk2ui/skia_utils_gtk2.h"
 #include "grit/theme_resources.h"
 #include "grit/ui_resources.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/skia/include/core/SkCanvas.h"
@@ skipping 262 matching lines @@
   // Only realized widgets receive style-set notifications, which we need to
   // broadcast new theme images and colors. Only realized widgets have style
   // properties, too, which we query for some colors.
   gtk_widget_realize(fake_frame_);
   gtk_widget_realize(fake_window_);
   // TODO: Also listen for "style-set" on the fake frame.
 
   // TODO(erg): Be lazy about generating this data and connect it to the
   // style-set signal handler.
   LoadGtkValues();
+  SetXDGIconTheme();
 }
 
 Gtk2UI::~Gtk2UI() {
   gtk_widget_destroy(fake_window_);
   gtk_widget_destroy(fake_frame_);
   fake_label_.Destroy();
   fake_entry_.Destroy();
 
   ClearAllThemeData();
 }
@@ skipping 127 matching lines @@
   if (theme_thumb_active)
     *thumb_active_color = *theme_thumb_active;
 
   if (theme_thumb_inactive)
     *thumb_inactive_color = *theme_thumb_inactive;
 
   if (theme_trough_color)
     *track_color = *theme_trough_color;
 }
 
+void Gtk2UI::SetXDGIconTheme() {
+  gchar* gtk_theme_name;
+  g_object_get(gtk_settings_get_default(),
+               "gtk-icon-theme-name",
+               &gtk_theme_name, NULL);
+  base::nix::SetIconThemeName(gtk_theme_name);
+  g_free(gtk_theme_name);
+}
+
 void Gtk2UI::LoadGtkValues() {
   // TODO(erg): GtkThemeService had a comment here about having to muck with
   // the raw Prefs object to remove prefs::kCurrentThemeImages or else we'd
   // regress startup time. Figure out how to do that when we can't access the
   // prefs system from here.
 
   GtkStyle* frame_style = gtk_rc_get_style(fake_frame_);
 
   GtkStyle* window_style = gtk_rc_get_style(fake_window_);
   SetThemeColorFromGtk(ThemeService::COLOR_CONTROL_BACKGROUND,
@@ skipping 507 matching lines @@
 
 void Gtk2UI::ClearAllThemeData() {
   STLDeleteValues(&gtk_images_);
 }
 
 }  // namespace libgtk2ui
 
 ui::LinuxUI* BuildGtk2UI() {
   return new libgtk2ui::Gtk2UI;
 }