Change userid from a uint32_t to a string guid

content/common/mojo/mojo_shell_connection_impl.cc

Index: content/common/mojo/mojo_shell_connection_impl.cc
diff --git a/content/common/mojo/mojo_shell_connection_impl.cc b/content/common/mojo/mojo_shell_connection_impl.cc
index f63154000239cb9c868561cb08360b303cdeb8dc..eb11c9695feeef71d1dbf93448e4b188f2071b2e 100644
--- a/content/common/mojo/mojo_shell_connection_impl.cc
+++ b/content/common/mojo/mojo_shell_connection_impl.cc
@@ -96,8 +96,8 @@ void MojoShellConnectionImpl::WaitForShell(
 
 void MojoShellConnectionImpl::Initialize(mojo::Connector* connector,
                                          const std::string& url,
-                                         uint32_t id,
-                                         uint32_t user_id) {
+                                         const std::string& user_id,
+                                         uint32_t id) {
   initialized_ = true;
 }