mash: Remove app_driver.

mash/session/session.cc

Index: mash/session/session.cc
diff --git a/mash/session/session.cc b/mash/session/session.cc
index 24b64cb246b61f2d81b01778a2abce9b9aa6ab64..fff0686ae3261d20e67669fecd63c5695fc36844 100644
--- a/mash/session/session.cc
+++ b/mash/session/session.cc
@@ -28,7 +28,6 @@ Session::Session() : screen_locked_(false) {}
 Session::~Session() {}
 
 void Session::OnStart(const service_manager::ServiceInfo& info) {
-  StartAppDriver();
   StartWindowManager();
   StartQuickLaunch();
   // Launch a chrome window for dev convience; don't do this in the long term.
@@ -96,12 +95,6 @@ void Session::StartWindowManager() {
                  base::Unretained(this)));
 }
 
-void Session::StartAppDriver() {
-  StartRestartableService(
-      "service:app_driver",
-      base::Bind(&Session::StartAppDriver, base::Unretained(this)));
-}
-
 void Session::StartQuickLaunch() {
   StartRestartableService(
       "service:quick_launch",