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

chrome/browser/ui/gtk/gtk_theme_service.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/gtk/gtk_theme_service.h"
 
 #include <gtk/gtk.h>
 
 #include <set>
 #include <string>
 
 #include "base/debug/trace_event.h"
 #include "base/environment.h"
+#include "base/nix/mime_util_xdg.h"
 #include "base/nix/xdg_util.h"
 #include "base/prefs/pref_service.h"
 #include "base/stl_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/themes/theme_service_factory.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_iterator.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/gtk/chrome_gtk_frame.h"
 #include "chrome/browser/ui/gtk/gtk_chrome_button.h"
@@ skipping 597 matching lines @@
 }
 
 void GtkThemeService::LoadThemePrefs() {
   if (use_gtk_) {
     LoadGtkValues();
   } else {
     LoadDefaultValues();
     ThemeService::LoadThemePrefs();
   }
 
+  SetXDGIconTheme();
   RebuildMenuIconSets();
 }
 
 void GtkThemeService::NotifyThemeChanged() {
   ThemeService::NotifyThemeChanged();
 
   // Notify all GtkChromeButtons of their new rendering mode:
   for (std::vector<GtkWidget*>::iterator it = chrome_buttons_.begin();
        it != chrome_buttons_.end(); ++it) {
     gtk_chrome_button_set_use_gtk_rendering(
@@ skipping 34 matching lines @@
 
   if (profile()->GetPrefs()->GetBoolean(prefs::kUsesSystemTheme)) {
     ClearAllThemeData();
     LoadGtkValues();
     NotifyThemeChanged();
   }
 
   RebuildMenuIconSets();
 }
 
+void GtkThemeService::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 GtkThemeService::LoadGtkValues() {
   // Before we start setting images and values, we have to clear out old, stale
   // values. (If we don't do this, we'll regress startup time in the case where
   // someone installs a heavyweight theme, then goes back to GTK.)
   profile()->GetPrefs()->ClearPref(prefs::kCurrentThemeImages);
 
   GtkStyle* frame_style = gtk_rc_get_style(fake_frame_);
 
   GtkStyle* window_style = gtk_rc_get_style(fake_window_);
   SetThemeColorFromGtk(ThemeService::COLOR_CONTROL_BACKGROUND,
@@ skipping 448 matching lines @@
   cairo_stroke(cr);
   cairo_destroy(cr);
   cairo_pattern_destroy(pattern);
 
   return TRUE;
 }
 
 void GtkThemeService::OnUsesSystemThemeChanged() {
   use_gtk_ = profile()->GetPrefs()->GetBoolean(prefs::kUsesSystemTheme);
 }