Eliminate mojo::Shell client lib class

mash/browser_driver/browser_driver_application_delegate.h

Index: mash/browser_driver/browser_driver_application_delegate.h
diff --git a/mash/browser_driver/browser_driver_application_delegate.h b/mash/browser_driver/browser_driver_application_delegate.h
index ff2aa9a22f05d2b61fd0dca28f4554ee96034b99..cbe63cf97656a0b1a51adfe72fe34c5ca9a24213 100644
--- a/mash/browser_driver/browser_driver_application_delegate.h
+++ b/mash/browser_driver/browser_driver_application_delegate.h
@@ -27,7 +27,7 @@ class BrowserDriverApplicationDelegate : public mojo::ShellClient,
 
  private:
   // mojo::ShellClient:
-  void Initialize(mojo::Shell* shell, const std::string& url,
+  void Initialize(mojo::Connector* connector, const std::string& url,
                   uint32_t id, uint32_t user_id) override;
   bool AcceptConnection(mojo::Connection* connection) override;
 
@@ -36,7 +36,7 @@ class BrowserDriverApplicationDelegate : public mojo::ShellClient,
 
   void AddAccelerators();
 
-  mojo::Shell* shell_;
+  mojo::Connector* connector_;
   mojo::Binding<mus::mojom::AcceleratorHandler> binding_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserDriverApplicationDelegate);