Fix passing pointers between processes.

BUG=31880
Review URL: http://codereview.chromium.org/558036

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@37555 0039d316-1c4b-4281-b951-d872f2087c98
void WebPluginImpl::WillDestroyWindow(gfx::PluginWindowHandle window) {
  DCHECK_EQ(window, window_);
  window_ = NULL;
  if (page_delegate_)
    page_delegate_->WillDestroyPluginWindow(window);
}

void WebPluginImpl::WillDestroyWindow(gfx::PluginWindowHandle window) {
  DCHECK_EQ(window, window_);
  window_ = NULL;
  if (page_delegate_)
    page_delegate_->WillDestroyPluginWindow(window);
}
