Use unique URLs rather than qualifiers to uniquify RenderProcesses.

mojo/shell/application_manager.cc

Index: mojo/shell/application_manager.cc
diff --git a/mojo/shell/application_manager.cc b/mojo/shell/application_manager.cc
index facade76eeea3e0faaf63f0f7e1b239aed3ff496..1e9e2a7da6f26a6b257e16f596c192a84cdba4da 100644
--- a/mojo/shell/application_manager.cc
+++ b/mojo/shell/application_manager.cc
@@ -117,15 +117,14 @@ ApplicationInstance* ApplicationManager::GetApplicationInstance(
 }
 
 void ApplicationManager::CreateInstanceForHandle(ScopedHandle channel,
-                                                 const GURL& url,
-                                                 const std::string& qualifier) {
+                                                 const GURL& url) {
   // Instances created by others are considered unique, and thus have no
   // identity. As such they cannot be connected to by anyone else, and so we
   // never call ConnectToClient().
   // TODO(beng): GetPermissiveCapabilityFilter() here obviously cannot make it
   //             to production. See note in application_manager.mojom.
   //             http://crbug.com/555392
-  Identity target_id(url, qualifier, GetPermissiveCapabilityFilter());
+  Identity target_id(url, std::string(), GetPermissiveCapabilityFilter());
   InterfaceRequest<Application> application_request =
       CreateInstance(target_id, base::Closure(), nullptr);
   NativeRunner* runner =