allow unit_tests to re-create service manager context.

content/browser/child_process_launcher_helper_linux.cc

Index: content/browser/child_process_launcher_helper_linux.cc
diff --git a/content/browser/child_process_launcher_helper_linux.cc b/content/browser/child_process_launcher_helper_linux.cc
index b0c476d682c61a98c116b638a5e38e5cf74f39fb..af1a72d894f31afbd1228aa0acf36cd84f11c535 100644
--- a/content/browser/child_process_launcher_helper_linux.cc
+++ b/content/browser/child_process_launcher_helper_linux.cc
@@ -152,6 +152,11 @@ void ChildProcessLauncherHelper::SetRegisteredFilesForService(
 }
 
 // static
+void ChildProcessLauncherHelper::ResetRegisteredFilesForTesting() {
+  ResetFilesToShareForTestingPosix();
+}
+
+// static
 base::File OpenFileToShare(const base::FilePath& path,
                            base::MemoryMappedFile::Region* region) {
   base::FilePath exe_dir;