Fix PreRunValidation calls in two of UIThreadExtensionFunction's subclasses.

chrome/browser/chromeos/extensions/file_system_provider/provider_function.cc

Index: chrome/browser/chromeos/extensions/file_system_provider/provider_function.cc
diff --git a/chrome/browser/chromeos/extensions/file_system_provider/provider_function.cc b/chrome/browser/chromeos/extensions/file_system_provider/provider_function.cc
index 4e6dcba49b5e5e6476881f8580d055d6f0ddb91b..2996239f2dfba92bbf258dc56b4a35b55bd66d80 100644
--- a/chrome/browser/chromeos/extensions/file_system_provider/provider_function.cc
+++ b/chrome/browser/chromeos/extensions/file_system_provider/provider_function.cc
@@ -147,6 +147,9 @@ FileSystemProviderInternalFunction::FulfillRequest(
 }
 
 bool FileSystemProviderInternalFunction::PreRunValidation(std::string* error) {
+  if (!UIThreadExtensionFunction::PreRunValidation(error))
+    return false;
+
   std::string file_system_id;
 
   EXTENSION_FUNCTION_PRERUN_VALIDATE(args_->GetString(0, &file_system_id));