Be able to print items that do window.print(); window.close() (airline tix e.g.)

chrome/browser/printing/print_preview_tab_controller.cc

Index: chrome/browser/printing/print_preview_tab_controller.cc
diff --git a/chrome/browser/printing/print_preview_tab_controller.cc b/chrome/browser/printing/print_preview_tab_controller.cc
index c552adac813b0a084e0d570ae2e3605ecef297ad..c5001a128355dfeeefdabd7c0206e8c97d726163 100644
--- a/chrome/browser/printing/print_preview_tab_controller.cc
+++ b/chrome/browser/printing/print_preview_tab_controller.cc
@@ -5,8 +5,10 @@
 #include "chrome/browser/printing/print_preview_tab_controller.h"
 
 #include "base/command_line.h"
+#include "base/debug/stack_trace.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/printing/background_printing_manager.h"
 #include "chrome/browser/sessions/restore_tab_helper.h"
 #include "chrome/browser/tabs/tab_strip_model.h"
 #include "chrome/browser/ui/browser.h"
@@ -138,8 +140,13 @@ void PrintPreviewTabController::Observe(int type,
   if (source_tab_is_preview_tab) {
     // Remove the initiator tab's observers before erasing the mapping.
     TabContents* initiator_tab = GetInitiatorTab(source_tab);
-    if (initiator_tab)
+    if (initiator_tab) {
       RemoveObservers(initiator_tab);
+      TabContentsWrapper* initiator_wrapper =
+          TabContentsWrapper::GetCurrentWrapperForContents(initiator_tab);
+      g_browser_process->background_printing_manager()->
+          ReleaseInitiatorTabContents(initiator_wrapper);
+    }
 
     // |source_tab_is_preview_tab| is misleading in the case where the user
     // chooses to re-open the initiator tab after closing it, as |source_tab|
@@ -152,6 +159,7 @@ void PrintPreviewTabController::Observe(int type,
     }
 
     // Erase the map entry.
+    DLOG(INFO) << "erasing " << (void*)source_tab;
     preview_tab_map_.erase(source_tab);
   } else {
     // Initiator tab is closed. Disable the controls in preview tab.
@@ -160,6 +168,7 @@ void PrintPreviewTabController::Observe(int type,
     print_preview_ui->OnInitiatorTabClosed(source_tab->GetURL().spec());
 
     // |source_tab| is an initiator tab, update the map entry.
+    DLOG(INFO) << "initiator tab closed; NULLING " << (void*)preview_tab;
     preview_tab_map_[preview_tab] = NULL;
   }
   RemoveObservers(source_tab);
@@ -179,6 +188,8 @@ void PrintPreviewTabController::EraseInitiatorTabInfo(
     return;
 
   RemoveObservers(it->second);
+  DLOG(INFO) << __FUNCTION__ << ' ' << (void*)preview_tab;
+  base::debug::StackTrace().PrintBacktrace();
   preview_tab_map_[preview_tab] = NULL;
 }