[Mac] Factor out keyboard shortcut handling from ChromeEventProcessingWindow.

ui/views/examples/webview_example.h

Index: ui/views/examples/webview_example.h
diff --git a/ui/views/examples/webview_example.h b/ui/views/examples/webview_example.h
index 207cb35cf6594cb233749098f0a0632da1e89c79..f04c87e8403d8c6ddab56b7273d20adca0f98dc1 100644
--- a/ui/views/examples/webview_example.h
+++ b/ui/views/examples/webview_example.h
@@ -6,6 +6,8 @@
 #define UI_VIEWS_EXAMPLES_WEBVIEW_EXAMPLE_H_
 
 #include "base/macros.h"
+#include "content/public/browser/web_contents_delegate.h"
+#include "ui/views/controls/webview/unhandled_keyboard_event_handler.h"
 #include "ui/views/examples/example_base.h"
 
 namespace content {
@@ -17,7 +19,7 @@ class WebView;
 
 namespace examples {
 
-class WebViewExample : public ExampleBase {
+class WebViewExample : public ExampleBase, public content::WebContentsDelegate {
  public:
   explicit WebViewExample(content::BrowserContext* browser_context);
   ~WebViewExample() override;
@@ -25,9 +27,15 @@ class WebViewExample : public ExampleBase {
   // ExampleBase:
   void CreateExampleView(View* container) override;
 
+  // content::WebContentsDelegate:
+  void HandleKeyboardEvent(
+      content::WebContents* source,
+      const content::NativeWebKeyboardEvent& event) override;
+
  private:
   WebView* webview_;
   content::BrowserContext* browser_context_;
+  views::UnhandledKeyboardEventHandler unhandled_keyboard_event_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(WebViewExample);
 };