Start consolidating cross-port file selection code into ui/base/dialogs.

chrome/browser/extensions/api/file_system/file_system_api.cc

Index: chrome/browser/extensions/api/file_system/file_system_api.cc
diff --git a/chrome/browser/extensions/api/file_system/file_system_api.cc b/chrome/browser/extensions/api/file_system/file_system_api.cc
index d70eea3cd5feda788bd7bec34a7e616e99e31873..d3ef0f2b90463ea5967f7be2034079557dc18926 100644
--- a/chrome/browser/extensions/api/file_system/file_system_api.cc
+++ b/chrome/browser/extensions/api/file_system/file_system_api.cc
@@ -9,6 +9,7 @@
 #include "base/file_util.h"
 #include "chrome/browser/extensions/shell_window_registry.h"
 #include "chrome/browser/platform_util.h"
+#include "chrome/browser/ui/chrome_select_file_policy.h"
 #include "chrome/browser/ui/extensions/shell_window.h"
 #include "chrome/browser/ui/select_file_dialog.h"
 #include "chrome/common/extensions/api/file_system.h"
@@ -117,7 +118,8 @@ class FileSystemPickerFunction::FilePicker : public SelectFileDialog::Listener {
       : suggested_path_(suggested_path),
         for_save_(for_save),
         function_(function) {
-    select_file_dialog_ = SelectFileDialog::Create(this);
+    select_file_dialog_ = SelectFileDialog::Create(
+        this, new ChromeSelectFilePolicy(web_contents));
     SelectFileDialog::FileTypeInfo file_type_info;
     FilePath::StringType extension = suggested_path.Extension();
     if (!extension.empty()) {
@@ -144,13 +146,14 @@ class FileSystemPickerFunction::FilePicker : public SelectFileDialog::Listener {
       return;
     }
 
-    select_file_dialog_->SelectFile(for_save ?
-                                        SelectFileDialog::SELECT_SAVEAS_FILE :
-                                        SelectFileDialog::SELECT_OPEN_FILE,
-                                    string16(),
-                                    suggested_path,
-                                    &file_type_info, 0, FILE_PATH_LITERAL(""),
-                                    web_contents, owning_window, NULL);
+    select_file_dialog_->SelectFile(
+        for_save ?
+            SelectFileDialog::SELECT_SAVEAS_FILE :
+            SelectFileDialog::SELECT_OPEN_FILE,
+        string16(),
+        suggested_path,
+        &file_type_info, 0, FILE_PATH_LITERAL(""),
+        owning_window, NULL);
   }
 
   virtual ~FilePicker() {}