libcef/browser/chrome/views/browser_platform_delegate_chrome_views.cc [12:42]:
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namespace {

// Default popup window delegate implementation.
class PopupWindowDelegate : public CefWindowDelegate {
 public:
  explicit PopupWindowDelegate(CefRefPtr<CefBrowserView> browser_view)
      : browser_view_(browser_view) {}

  void OnWindowCreated(CefRefPtr<CefWindow> window) override {
    window->AddChildView(browser_view_);
    window->Show();
    browser_view_->RequestFocus();
  }

  void OnWindowDestroyed(CefRefPtr<CefWindow> window) override {
    browser_view_ = nullptr;
  }

  bool CanClose(CefRefPtr<CefWindow> window) override {
    CefRefPtr<CefBrowser> browser = browser_view_->GetBrowser();
    if (browser)
      return browser->GetHost()->TryCloseBrowser();
    return true;
  }

 private:
  CefRefPtr<CefBrowserView> browser_view_;

  IMPLEMENT_REFCOUNTING(PopupWindowDelegate);
  DISALLOW_COPY_AND_ASSIGN(PopupWindowDelegate);
};
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libcef/browser/views/browser_platform_delegate_views.cc [18:48]:
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namespace {

// Default popup window delegate implementation.
class PopupWindowDelegate : public CefWindowDelegate {
 public:
  explicit PopupWindowDelegate(CefRefPtr<CefBrowserView> browser_view)
      : browser_view_(browser_view) {}

  void OnWindowCreated(CefRefPtr<CefWindow> window) override {
    window->AddChildView(browser_view_);
    window->Show();
    browser_view_->RequestFocus();
  }

  void OnWindowDestroyed(CefRefPtr<CefWindow> window) override {
    browser_view_ = nullptr;
  }

  bool CanClose(CefRefPtr<CefWindow> window) override {
    CefRefPtr<CefBrowser> browser = browser_view_->GetBrowser();
    if (browser)
      return browser->GetHost()->TryCloseBrowser();
    return true;
  }

 private:
  CefRefPtr<CefBrowserView> browser_view_;

  IMPLEMENT_REFCOUNTING(PopupWindowDelegate);
  DISALLOW_COPY_AND_ASSIGN(PopupWindowDelegate);
};
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