mojo: Fix crash in example WM when closing window.

mojo/examples/window_manager/window_manager.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 "base/basictypes.h"
 #include "base/bind.h"
 #include "mojo/application/application_runner_chromium.h"
 #include "mojo/examples/keyboard/keyboard.mojom.h"
 #include "mojo/examples/window_manager/debug_panel.h"
 #include "mojo/examples/window_manager/window_manager.mojom.h"
@@ skipping 281 matching lines @@
   virtual ~WindowManager() {
     // host() may be destroyed by the time we get here.
     // TODO: figure out a way to always cleanly remove handler.
     if (window_manager_app_->host())
       window_manager_app_->host()->window()->RemovePreTargetHandler(this);
   }
 
   void CloseWindow(Id view_id) {
     WindowVector::iterator iter = GetWindowByViewId(view_id);
     DCHECK(iter != windows_.end());
+    Window* window = *iter;
     windows_.erase(iter);
-    (*iter)->view()->Destroy();
+    window->view()->Destroy();
   }
 
   void ShowKeyboard(Id view_id, const gfx::Rect& bounds) {
     // TODO: this needs to validate |view_id|. That is, it shouldn't assume
     // |view_id| is valid and it also needs to make sure the client that sent
     // this really owns |view_id|.
     // TODO: honor |bounds|.
     if (!keyboard_manager_) {
       keyboard_manager_.reset(new KeyboardManager);
       View* parent = view_manager_->GetRoots().back();
@@ skipping 241 matching lines @@
   window_manager_->RequestNavigate(view_id_, target, request.Pass());
 }
 
 }  // namespace examples
 }  // namespace mojo
 
 MojoResult MojoMain(MojoHandle shell_handle) {
   mojo::ApplicationRunnerChromium runner(new mojo::examples::WindowManager);
   return runner.Run(shell_handle);
 }