chromeos: Move functions in file_manager_util.cc to unnamed namespace

chrome/browser/chromeos/extensions/file_manager_util.h

Index: chrome/browser/chromeos/extensions/file_manager_util.h
diff --git a/chrome/browser/chromeos/extensions/file_manager_util.h b/chrome/browser/chromeos/extensions/file_manager_util.h
index 96c210d5aa57d224c8349f2b554cc3dcae66d30b..c0ea6f0f2e81f4250b6c53a605c824d8e6829975 100644
--- a/chrome/browser/chromeos/extensions/file_manager_util.h
+++ b/chrome/browser/chromeos/extensions/file_manager_util.h
@@ -6,10 +6,9 @@
 #define CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_UTIL_H_
 
 #include <string>
-#include <vector>
 
 #include "base/file_path.h"
-#include "chrome/browser/google_apis/drive_service_interface.h"
+#include "chrome/browser/google_apis/operation_registry.h"
 #include "googleurl/src/gurl.h"
 #include "ui/shell_dialogs/select_file_dialog.h"
 
@@ -89,8 +88,6 @@ bool ExecuteBuiltinHandler(
     const FilePath& path,
     const std::string& internal_task_id);
 
-void InstallCRX(Browser* browser, const FilePath& path);
-
 bool ShouldBeOpenedWithPdfPlugin(Profile* profile, const char* file_extension);
 
 // Converts the vector of progress status to their JSON (Value) form.