Fixing a possible NULL pointer dereference in NativeWidgetAura.

ui/views/widget/native_widget_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 "ui/views/widget/native_widget_aura.h"
 
 #include "base/bind.h"
 #include "base/strings/string_util.h"
 #include "third_party/skia/include/core/SkRegion.h"
 #include "ui/aura/client/aura_constants.h"
@@ skipping 842 matching lines @@
     // If a ui::InputMethod object is attached to the root window, character
     // events are handled inside the object and are not passed to this function.
     // If such object is not attached, character events might be sent (e.g. on
     // Windows). In this case, we just skip these.
     return;
   }
   // Renderer may send a key event back to us if the key event wasn't handled,
   // and the window may be invisible by that time.
   if (!window_->IsVisible())
     return;
-  GetWidget()->GetInputMethod()->DispatchKeyEvent(*event);
+  InputMethod* input_method = GetWidget()->GetInputMethod();
+  if (!input_method)
+    return;
+  input_method->DispatchKeyEvent(*event);
   if (switches::IsTextInputFocusManagerEnabled()) {
     FocusManager* focus_manager = GetWidget()->GetFocusManager();
     delegate_->OnKeyEvent(event);
     if (!event->handled() && focus_manager)
       focus_manager->OnKeyEvent(*event);
   }
   event->SetHandled();
 }
 
 void NativeWidgetAura::OnMouseEvent(ui::MouseEvent* event) {
@@ skipping 298 matching lines @@
   l10n_util::AdjustUIFont(&(ncm.lfCaptionFont));
   base::win::ScopedHFONT caption_font(CreateFontIndirect(&(ncm.lfCaptionFont)));
   return gfx::FontList(gfx::Font(caption_font));
 #else
   return gfx::FontList();
 #endif
 }
 
 }  // namespace internal
 }  // namespace views