Revert of Revive experiment to isolate shell operations.

chrome/browser/win/chrome_select_file_dialog_factory.h

Index: chrome/browser/win/chrome_select_file_dialog_factory.h
diff --git a/chrome/browser/win/chrome_select_file_dialog_factory.h b/chrome/browser/win/chrome_select_file_dialog_factory.h
index 52b2913338d31614e0dc786443bb35fa489ce91e..b1d8745f19e9d7f212d91086f3a379a270125e1e 100644
--- a/chrome/browser/win/chrome_select_file_dialog_factory.h
+++ b/chrome/browser/win/chrome_select_file_dialog_factory.h
@@ -5,8 +5,14 @@
 #ifndef CHROME_BROWSER_WIN_CHROME_SELECT_FILE_DIALOG_FACTORY_H_
 #define CHROME_BROWSER_WIN_CHROME_SELECT_FILE_DIALOG_FACTORY_H_
 
+#include "base/compiler_specific.h"
 #include "base/macros.h"
+#include "base/memory/ref_counted.h"
 #include "ui/shell_dialogs/select_file_dialog_factory.h"
+
+namespace base {
+class SequencedTaskRunner;
+}  // namespace base
 
 // Implements a Select File dialog that delegates to a Metro file picker on
 // Metro and to a utility process otherwise. The utility process is used in
@@ -14,7 +20,9 @@
 // caused by Shell extension modules loaded by GetOpenFileName.
 class ChromeSelectFileDialogFactory : public ui::SelectFileDialogFactory {
  public:
-  ChromeSelectFileDialogFactory();
+  // Uses |blocking_task_runner| to perform IPC with the utility process.
+  explicit ChromeSelectFileDialogFactory(
+      const scoped_refptr<base::SequencedTaskRunner>& blocking_task_runner);
   ~ChromeSelectFileDialogFactory() override;
 
   // ui::SelectFileDialogFactory implementation
@@ -22,6 +30,8 @@
                                ui::SelectFilePolicy* policy) override;
 
  private:
+  scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_;
+
   DISALLOW_COPY_AND_ASSIGN(ChromeSelectFileDialogFactory);
 };