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

chrome/browser/chrome_browser_main.cc

Index: chrome/browser/chrome_browser_main.cc
diff --git a/chrome/browser/chrome_browser_main.cc b/chrome/browser/chrome_browser_main.cc
index 1ce14f1f5f4c80aeb70a6f6bd8e3ac0621f5cea6..7262a09c5af7757a5efed8f90d032b5150e94325 100644
--- a/chrome/browser/chrome_browser_main.cc
+++ b/chrome/browser/chrome_browser_main.cc
@@ -37,6 +37,7 @@
 #include "chrome/browser/browser_process_impl.h"
 #include "chrome/browser/browser_shutdown.h"
 #include "chrome/browser/chrome_browser_main_extra_parts.h"
+#include "chrome/browser/chrome_select_file_policy.h"
 #include "chrome/browser/defaults.h"
 #include "chrome/browser/extensions/default_apps_trial.h"
 #include "chrome/browser/extensions/extension_protocols.h"
@@ -82,6 +83,7 @@
 #include "chrome/browser/translate/translate_manager.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_finder.h"
+#include "chrome/browser/ui/select_file_dialog.h"
 #include "chrome/browser/ui/startup/startup_browser_creator.h"
 #include "chrome/browser/ui/user_data_dir_dialog.h"
 #include "chrome/browser/ui/webui/chrome_url_data_manager_backend.h"
@@ -1259,6 +1261,9 @@ int ChromeBrowserMainParts::PreCreateThreadsImpl() {
   // just changed it to include experiments.
   child_process_logging::SetCommandLine(CommandLine::ForCurrentProcess());
 
+  // We should check chrome policy before spawning a dialog.
+  SelectFileDialog::SetFilePolicy(new ChromeSelectFilePolicy);
+
   // If we're running tests (ui_task is non-null), then the ResourceBundle
   // has already been initialized.
   if (parameters().ui_task) {