Get rid of KeepAlive. Quit shell when all urls run directly by Context are closed.

mojo/shell/in_process_dynamic_service_runner.cc

Index: mojo/shell/in_process_dynamic_service_runner.cc
diff --git a/mojo/shell/in_process_dynamic_service_runner.cc b/mojo/shell/in_process_dynamic_service_runner.cc
index 25431a845f2de569c42d743e84cb6214e8982d1e..057d84b66dfef699f80d07ae98116356c84dcdaf 100644
--- a/mojo/shell/in_process_dynamic_service_runner.cc
+++ b/mojo/shell/in_process_dynamic_service_runner.cc
@@ -112,8 +112,9 @@ void InProcessDynamicServiceRunner::Run() {
 #if !defined(COMPONENT_BUILD)
         // Warn on this really weird case: The library requires the GLES2
         // control functions, but doesn't require the GLES2 implementation.
-        LOG(WARNING) << "App library has MojoSetGLES2ControlThunks, but "
-                        "doesn't have MojoSetGLES2ImplThunks.";
+        LOG(WARNING) << app_path_.value()
+                     << " has MojoSetGLES2ControlThunks, "
+                        "but doesn't have MojoSetGLES2ImplThunks.";
 #endif
       }