Abstract base 'ExtensionView' to Fix DEPS violation in extension_view_host.h

chrome/browser/extensions/extension_view_host_mac.mm

 // Copyright 2013 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 "chrome/browser/extensions/extension_view_host_mac.h"
 
 #import "base/mac/foundation_util.h"
 #import "chrome/browser/ui/cocoa/chrome_event_processing_window.h"
 #import "chrome/browser/ui/cocoa/extensions/extension_popup_controller.h"
 #import "chrome/browser/ui/cocoa/info_bubble_window.h"
-#include "content/public/browser/native_web_keyboard_event.h"
-
-using content::NativeWebKeyboardEvent;
 
 namespace extensions {
 
 ExtensionViewHostMac::~ExtensionViewHostMac() {
   // If there is a popup open for this host's extension, close it.
   ExtensionPopupController* popup = [ExtensionPopupController popup];
   InfoBubbleWindow* window =
       base::mac::ObjCCast<InfoBubbleWindow>([popup window]);
   if ([window isVisible] && [popup extensionViewHost] == this) {
     [window setAllowedAnimations:info_bubble::kAnimateNone];
     [popup close];
   }
 }
 
-void ExtensionViewHostMac::UnhandledKeyboardEvent(
-    content::WebContents* source,
-    const NativeWebKeyboardEvent& event) {
-  if (event.skip_in_browser || event.type == NativeWebKeyboardEvent::Char ||
-      extension_host_type() != VIEW_TYPE_EXTENSION_POPUP) {
-    return;
-  }
-
-  ChromeEventProcessingWindow* event_window =
-      static_cast<ChromeEventProcessingWindow*>([view()->native_view() window]);
-  DCHECK([event_window isKindOfClass:[ChromeEventProcessingWindow class]]);
-  [event_window redispatchKeyEvent:event.os_event];
-}
-
 }  // namespace extensions