Wire up process launch error codes.

content/browser/child_process_launcher_browsertest.cc

Index: content/browser/child_process_launcher_browsertest.cc
diff --git a/content/browser/child_process_launcher_browsertest.cc b/content/browser/child_process_launcher_browsertest.cc
index 9ef655c6fc6ef22dd3bdb12d12e67f58135872d6..f48279b765741e163688ff516c2f3f196f0e8cd7 100644
--- a/content/browser/child_process_launcher_browsertest.cc
+++ b/content/browser/child_process_launcher_browsertest.cc
@@ -23,11 +23,14 @@ class MockChildProcessLauncherClient
 
   void OnProcessLaunched() override {
     if (simulate_failure_)
-      client_->OnProcessLaunchFailed();
+      client_->OnProcessLaunchFailed(content::LAUNCH_RESULT_FAILURE);
     else
       client_->OnProcessLaunched();
   };
-  void OnProcessLaunchFailed() override { client_->OnProcessLaunchFailed(); };
+
+  void OnProcessLaunchFailed(int error_code) override {
+    client_->OnProcessLaunchFailed(error_code);
+  };
 
   content::ChildProcessLauncher::Client* client_;
   bool simulate_failure_;