Sets transient for PrintDialogGtk2

chrome/browser/ui/libgtk2ui/print_dialog_gtk2.cc

Index: chrome/browser/ui/libgtk2ui/print_dialog_gtk2.cc
diff --git a/chrome/browser/ui/libgtk2ui/print_dialog_gtk2.cc b/chrome/browser/ui/libgtk2ui/print_dialog_gtk2.cc
index ad36c46261f889400477759b877ce3026c6e1e4f..422c9cfeedee2ad12c601f7692a9bcd3af472eb0 100644
--- a/chrome/browser/ui/libgtk2ui/print_dialog_gtk2.cc
+++ b/chrome/browser/ui/libgtk2ui/print_dialog_gtk2.cc
@@ -17,10 +17,12 @@
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
+#include "chrome/browser/ui/libgtk2ui/gtk2_util.h"
 #include "chrome/browser/ui/libgtk2ui/printing_gtk2_util.h"
 #include "printing/metafile.h"
 #include "printing/print_job_constants.h"
 #include "printing/print_settings.h"
+#include "ui/aura/window.h"
 
 using content::BrowserThread;
 using printing::PageRanges;
@@ -136,6 +138,11 @@ PrintDialogGtk2::~PrintDialogGtk2() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
   if (dialog_) {
+    aura::Window* parent = libgtk2ui::GetAuraTransientParent(dialog_);
+    if (parent) {
+      parent->RemoveObserver(this);
+      libgtk2ui::ClearAuraTransientParent(dialog_);
+    }
     gtk_widget_destroy(dialog_);
     dialog_ = NULL;
   }
@@ -234,6 +241,8 @@ void PrintDialogGtk2::ShowDialog(
 
   // TODO(mukai): take care of parent as select_file_dialog_impl_gtk2.
   dialog_ = gtk_print_unix_dialog_new(NULL, NULL);
+  libgtk2ui::SetGtkTransientForAura(dialog_, parent_view);
+  parent_view->AddObserver(this);
   g_signal_connect(dialog_, "delete-event",
                    G_CALLBACK(gtk_widget_hide_on_delete), NULL);
 
@@ -432,3 +441,11 @@ void PrintDialogGtk2::InitPrintSettings(PrintSettings* settings) {
   InitPrintSettingsGtk(gtk_settings_, page_setup_, settings);
   context_->InitWithSettings(*settings);
 }
+
+void PrintDialogGtk2::OnWindowDestroying(aura::Window* window) {
+  DCHECK_EQ(libgtk2ui::GetAuraTransientParent(dialog_), window);
+
+  libgtk2ui::ClearAuraTransientParent(dialog_);
+  window->RemoveObserver(this);
+  Release();
+}