allow unit_tests to re-create service manager context.

content/browser/child_process_launcher.h

Index: content/browser/child_process_launcher.h
diff --git a/content/browser/child_process_launcher.h b/content/browser/child_process_launcher.h
index d145a9bd15e4bf6a8b548a59488e23d5ed86ee7f..63762f88413c4792d68158110918a0942c537869 100644
--- a/content/browser/child_process_launcher.h
+++ b/content/browser/child_process_launcher.h
@@ -132,6 +132,10 @@ class CONTENT_EXPORT ChildProcessLauncher : public base::NonThreadSafe {
       const std::string& service_name,
       catalog::RequiredFileMap required_files);
 
+  // Resets all files registered by |SetRegisteredFilesForService|. Used to
+  // support multiple shell context creation in unit_tests.
+  static void ResetRegisteredFilesForTesting();
+
  private:
   friend class internal::ChildProcessLauncherHelper;