Moves android specific code into android directory

shell/android/ui_application_loader_android.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "shell/ui_application_loader_android.h"
+#include "shell/android/ui_application_loader_android.h"
 
 #include "base/bind.h"
+#include "base/message_loop/message_loop.h"
 #include "mojo/application_manager/application_manager.h"
-#include "shell/context.h"
 
 namespace mojo {
 
 UIApplicationLoader::UIApplicationLoader(
     scoped_ptr<ApplicationLoader> real_loader,
-    shell::Context* context)
-    : loader_(real_loader.Pass()), context_(context) {
+    base::MessageLoop* ui_message_loop)
+    : loader_(real_loader.Pass()), ui_message_loop_(ui_message_loop) {
 }
 
 UIApplicationLoader::~UIApplicationLoader() {
-  context_->ui_loop()->PostTask(
+  ui_message_loop_->PostTask(
       FROM_HERE, base::Bind(&UIApplicationLoader::ShutdownOnUIThread,
                             base::Unretained(this)));
 }
 
 void UIApplicationLoader::Load(ApplicationManager* manager,
                                const GURL& url,
                                ScopedMessagePipeHandle shell_handle,
                                LoadCallback callback) {
   DCHECK(shell_handle.is_valid());
-  context_->ui_loop()->PostTask(
+  ui_message_loop_->PostTask(
       FROM_HERE,
       base::Bind(&UIApplicationLoader::LoadOnUIThread, base::Unretained(this),
                  manager, url, base::Passed(&shell_handle)));
 }
 
 void UIApplicationLoader::OnApplicationError(ApplicationManager* manager,
                                              const GURL& url) {
-  context_->ui_loop()->PostTask(
+  ui_message_loop_->PostTask(
       FROM_HERE, base::Bind(&UIApplicationLoader::OnApplicationErrorOnUIThread,
                             base::Unretained(this), manager, url));
 }
 
 void UIApplicationLoader::LoadOnUIThread(ApplicationManager* manager,
                                          const GURL& url,
                                          ScopedMessagePipeHandle shell_handle) {
   loader_->Load(manager, url, shell_handle.Pass(), SimpleLoadCallback());
 }
 
 void UIApplicationLoader::OnApplicationErrorOnUIThread(
     ApplicationManager* manager,
     const GURL& url) {
   loader_->OnApplicationError(manager, url);
 }
 
 void UIApplicationLoader::ShutdownOnUIThread() {
   // Destroy |loader_| on the thread it's actually used on.
   loader_.reset();
 }
 
 }  // namespace mojo