[linux] fix (inconsistent) crash when switching themes

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>
@@ skipping 560 matching lines @@
 // static
 gfx::Image GtkThemeService::GetFolderIcon(bool native) {
   if (native) {
     if (!icon_widget_)
       icon_widget_ = gtk_window_new(GTK_WINDOW_TOPLEVEL);
 
     if (default_folder_icon_.Get().IsEmpty()) {
       // This seems to leak.
       GdkPixbuf* pixbuf = gtk_widget_render_icon(
           icon_widget_, GTK_STOCK_DIRECTORY, GTK_ICON_SIZE_MENU, NULL);
-      if (pixbuf) {
+      if (pixbuf)
         default_folder_icon_.Get() = gfx::Image(pixbuf);
-        g_object_unref(pixbuf);
-      }
     }
     if (!default_folder_icon_.Get().IsEmpty())
       return default_folder_icon_.Get();
   }
 
   return ui::ResourceBundle::GetSharedInstance().GetNativeImageNamed(
       IDR_BOOKMARK_BAR_FOLDER);
 }
 
 // static
 gfx::Image GtkThemeService::GetDefaultFavicon(bool native) {
   if (native) {
     if (!icon_widget_)
       icon_widget_ = gtk_window_new(GTK_WINDOW_TOPLEVEL);
 
     if (default_bookmark_icon_.Get().IsEmpty()) {
       // This seems to leak.
       GdkPixbuf* pixbuf = gtk_widget_render_icon(
           icon_widget_, GTK_STOCK_FILE, GTK_ICON_SIZE_MENU, NULL);
-      if (pixbuf) {
+      if (pixbuf)
         default_bookmark_icon_.Get() = gfx::Image(pixbuf);
-        g_object_unref(pixbuf);
-      }
     }
     if (!default_bookmark_icon_.Get().IsEmpty())
       return default_bookmark_icon_.Get();
   }
 
   return ui::ResourceBundle::GetSharedInstance().GetNativeImageNamed(
       IDR_DEFAULT_FAVICON);
 }
 
 // static
@@ skipping 531 matching lines @@
   cairo_new_path(cr);
   cairo_set_line_width(cr, 1.0);
   cairo_move_to(cr, start_x, allocation.y);
   cairo_line_to(cr, start_x, allocation.y + allocation.height);
   cairo_stroke(cr);
   cairo_destroy(cr);
   cairo_pattern_destroy(pattern);
 
   return TRUE;
 }