Moves android specific code into android directory

shell/android/ui_application_loader_android.h

Index: shell/android/ui_application_loader_android.h
diff --git a/shell/ui_application_loader_android.h b/shell/android/ui_application_loader_android.h
similarity index 84%
rename from shell/ui_application_loader_android.h
rename to shell/android/ui_application_loader_android.h
index 64b13f07a97f3e9d6d31561fedb98b2960c641f1..7de34c721031cdac67186141adf48bfadc25ff4d 100644
--- a/shell/ui_application_loader_android.h
+++ b/shell/android/ui_application_loader_android.h
@@ -2,28 +2,28 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef SHELL_UI_APPLICATION_LOADER_ANDROID_H_
-#define SHELL_UI_APPLICATION_LOADER_ANDROID_H_
+#ifndef SHELL_ANDROID_UI_APPLICATION_LOADER_ANDROID_H_
+#define SHELL_ANDROID_UI_APPLICATION_LOADER_ANDROID_H_
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "mojo/application_manager/application_loader.h"
 
+namespace base {
+class MessageLoop;
+}
+
 namespace mojo {
 
 class ApplicationManager;
 
-namespace shell {
-class Context;
-}
-
 // ApplicationLoader implementation that creates a background thread and issues
 // load
 // requests there.
 class UIApplicationLoader : public ApplicationLoader {
  public:
   UIApplicationLoader(scoped_ptr<ApplicationLoader> real_loader,
-                      shell::Context* context);
+                      base::MessageLoop* ui_message_loop);
   ~UIApplicationLoader() override;
 
   // ApplicationLoader overrides:
@@ -49,11 +49,11 @@ class UIApplicationLoader : public ApplicationLoader {
   void ShutdownOnUIThread();
 
   scoped_ptr<ApplicationLoader> loader_;
-  shell::Context* context_;
+  base::MessageLoop* ui_message_loop_;
 
   DISALLOW_COPY_AND_ASSIGN(UIApplicationLoader);
 };
 
 }  // namespace mojo
 
-#endif  // SHELL_UI_APPLICATION_LOADER_ANDROID_H_
+#endif  // SHELL_ANDROID_UI_APPLICATION_LOADER_ANDROID_H_