Re-fix http://crbug.com/87176, and add a test.

content/browser/renderer_host/render_process_host_impl.h

Index: content/browser/renderer_host/render_process_host_impl.h
diff --git a/content/browser/renderer_host/render_process_host_impl.h b/content/browser/renderer_host/render_process_host_impl.h
index 5f528b1c491377884b78673a405e88c1fea24d69..6b8885c33c090cbaeb2da2b46806f816e672adb6 100644
--- a/content/browser/renderer_host/render_process_host_impl.h
+++ b/content/browser/renderer_host/render_process_host_impl.h
@@ -184,6 +184,21 @@ class CONTENT_EXPORT RenderProcessHostImpl
 
   static base::MessageLoop* GetInProcessRendererThreadForTesting();
 
+  void SetChildProcessLauncherFactory(
+      const base::Callback<scoped_ptr<ChildProcessLauncher>(
+#if defined(OS_WIN)
+          SandboxedProcessLauncherDelegate* delegate,
+#elif defined(OS_POSIX)
+          bool use_zygote,
+          const base::EnvironmentVector& environ,
+          int ipcfd,
+#endif
+          CommandLine* cmd_line,
+          int child_process_id,
+          ChildProcessLauncher::Client* client)>& factory) {
+    child_process_launcher_factory_ = factory;
+  }
+
  protected:
   // A proxy for our IPC::Channel that lives on the IO thread (see
   // browser_process.h)
@@ -278,6 +293,21 @@ class CONTENT_EXPORT RenderProcessHostImpl
   // also reset that in the case of process termination.
   bool is_initialized_;
 
+  // Used to mock out child_process_launcher_ in tests.  See
+  // NewChildProcessLauncher() for the interface.
+  base::Callback<scoped_ptr<ChildProcessLauncher>(
+#if defined(OS_WIN)
+      SandboxedProcessLauncherDelegate* delegate,
+#elif defined(OS_POSIX)
+      bool use_zygote,
+      const base::EnvironmentVector& environ,
+      int ipcfd,
+#endif
+      CommandLine* cmd_line,
+      int child_process_id,
+      ChildProcessLauncher::Client* client)>
+      child_process_launcher_factory_;
+
   // Used to launch and terminate the process without blocking the UI thread.
   scoped_ptr<ChildProcessLauncher> child_process_launcher_;