Fix crash/leak issue in native_view_host_gtk.cc.

views/controls/native/native_view_host_wrapper.h

 // Copyright (c) 2009 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.
 
 #ifndef VIEWS_CONTROLS_NATIVE_NATIVE_VIEW_HOST_WRAPPER_H_
 #define VIEWS_CONTROLS_NATIVE_NATIVE_VIEW_HOST_WRAPPER_H_
 
 namespace views {
 
 class NativeViewHost;
 
 // An interface that implemented by an object that wraps a gfx::NativeView on
 // a specific platform, used to perform platform specific operations on that
 // native view when attached, detached, moved and sized.
 class NativeViewHostWrapper {
  public:
   virtual ~NativeViewHostWrapper() {}
 
   // Called when a gfx::NativeView has been attached to the associated
   // NativeViewHost, allowing the wrapper to perform platform-specific
   // initialization.
   virtual void NativeViewAttached() = 0;
 
   // Called before the attached gfx::NativeView is detached from the
   // NativeViewHost, allowing the wrapper to perform platform-specific
-  // cleanup.
-  virtual void NativeViewDetaching() = 0;
+  // cleanup. |destroyed| is true if the native view is detached
+  // because it's being destroyed, or false otherwise.
+  virtual void NativeViewDetaching(bool destroyed) = 0;
 
   // Called when our associated NativeViewHost is added to a View hierarchy
   // rooted at a valid Widget.
   virtual void AddedToWidget() = 0;
 
   // Called when our associated NativeViewHost is removed from a View hierarchy
   // rooted at a valid Widget.
   virtual void RemovedFromWidget() = 0;
 
   // Installs a clip on the gfx::NativeView.
@@ skipping 17 matching lines @@
   virtual void SetFocus() = 0;
 
   // Creates a platform-specific instance of an object implementing this
   // interface.
   static NativeViewHostWrapper* CreateWrapper(NativeViewHost* host);
 };
 
 }  // namespace views
 
 #endif  // VIEWS_CONTROLS_NATIVE_NATIVE_VIEW_HOST_WRAPPER_H_