Use ShellPtr type in ApplicationLoader instead of untyped handles

shell/application_manager/application_manager_unittest.cc

Index: shell/application_manager/application_manager_unittest.cc
diff --git a/shell/application_manager/application_manager_unittest.cc b/shell/application_manager/application_manager_unittest.cc
index a3addb73baf76b8d3d7fd0604d6d1e323e647f57..f3b0503e071e4616cfd07d462f875930d6a6dba8 100644
--- a/shell/application_manager/application_manager_unittest.cc
+++ b/shell/application_manager/application_manager_unittest.cc
@@ -115,10 +115,10 @@ class TestApplicationLoader : public ApplicationLoader,
   // ApplicationLoader implementation.
   void Load(ApplicationManager* manager,
             const GURL& url,
-            ScopedMessagePipeHandle shell_handle,
+            ShellPtr shell,
             LoadCallback callback) override {
     ++num_loads_;
-    test_app_.reset(new ApplicationImpl(this, shell_handle.Pass()));
+    test_app_.reset(new ApplicationImpl(this, shell.Pass()));
   }
 
   void OnApplicationError(ApplicationManager* manager,
@@ -330,9 +330,9 @@ class Tester : public ApplicationDelegate,
  private:
   void Load(ApplicationManager* manager,
             const GURL& url,
-            ScopedMessagePipeHandle shell_handle,
+            ShellPtr shell,
             LoadCallback callback) override {
-    app_.reset(new ApplicationImpl(this, shell_handle.Pass()));
+    app_.reset(new ApplicationImpl(this, shell.Pass()));
   }
 
   void OnApplicationError(ApplicationManager* manager,