Makes sure that an input method doesn't reference to a destroyed object.

content/browser/renderer_host/render_widget_host_view_aura.cc

 // Copyright (c) 2012 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 "content/browser/renderer_host/render_widget_host_view_aura.h"
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
@@ skipping 2446 matching lines @@
   // If the tab was hidden and it's closed, host_->is_hidden would have been
   // reset to false in RenderWidgetHostImpl::RendererExited.
   if (!window_->GetRootWindow() || host_->is_hidden()) {
     parent = ui::GetHiddenWindow();
   } else {
     parent = window_->GetRootWindow()->GetAcceleratedWidget();
   }
   LPARAM lparam = reinterpret_cast<LPARAM>(this);
   EnumChildWindows(parent, WindowDestroyingCallback, lparam);
 #endif
+
+  // Make sure that the input method no longer references to this object before
+  // this object is removed from the root window (i.e. this object loses access
+  // to the input method).
+  ui::InputMethod* input_method = GetInputMethod();
+  if (input_method)
+    input_method->DetachTextInputClient(this);
 }
 
 void RenderWidgetHostViewAura::OnWindowDestroyed() {
   host_->ViewDestroyed();
   delete this;
 }
 
 void RenderWidgetHostViewAura::OnWindowTargetVisibilityChanged(bool visible) {
 }
 
@@ skipping 782 matching lines @@
     RenderWidgetHost* widget) {
   return new RenderWidgetHostViewAura(widget);
 }
 
 // static
 void RenderWidgetHostViewPort::GetDefaultScreenInfo(WebScreenInfo* results) {
   GetScreenInfoForWindow(results, NULL);
 }
 
 }  // namespace content