Implemented most of HtmlDialogWindowController, which is a Cocoa port

chrome/browser/cocoa/chrome_event_processing_window.mm

 // 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.
 
 #import "chrome/browser/cocoa/chrome_event_processing_window.h"
 
 #include "base/logging.h"
-#import "chrome/browser/cocoa/browser_window_controller.h"
+#import "chrome/browser/cocoa/browser_command_executor.h"
 #import "chrome/browser/cocoa/browser_frame_view.h"
 #import "chrome/browser/cocoa/tab_strip_controller.h"
 #import "chrome/browser/renderer_host/render_widget_host_view_mac.h"
 #include "chrome/browser/global_keyboard_shortcuts_mac.h"
 
 typedef int (*KeyToCommandMapper)(bool, bool, bool, bool, int);
 
 @implementation ChromeEventProcessingWindow
 
 - (BOOL)handleExtraKeyboardShortcut:(NSEvent*)event fromTable:
     (KeyToCommandMapper)commandForKeyboardShortcut {
   // Extract info from |event|.
   NSUInteger modifers = [event modifierFlags];
   const bool cmdKey = modifers & NSCommandKeyMask;
   const bool shiftKey = modifers & NSShiftKeyMask;
   const bool cntrlKey = modifers & NSControlKeyMask;
   const bool optKey = modifers & NSAlternateKeyMask;
   const int keyCode = [event keyCode];
 
   int cmdNum = commandForKeyboardShortcut(cmdKey, shiftKey, cntrlKey, optKey,
       keyCode);
 
-  BrowserWindowController* controller =
-      (BrowserWindowController*)[self delegate];
-  // A bit of sanity.
-  DCHECK([controller isKindOfClass:[BrowserWindowController class]]);
-  DCHECK([controller respondsToSelector:@selector(executeCommand:)]);
-
   if (cmdNum != -1) {
-    [controller executeCommand:cmdNum];
+    id executor = [self delegate];
+    // A bit of sanity.
+    DCHECK([executor conformsToProtocol:@protocol(BrowserCommandExecutor)]);
+    DCHECK([executor respondsToSelector:@selector(executeCommand:)]);
+    [executor executeCommand:cmdNum];
     return YES;
   }
   return NO;
 }
 
 - (BOOL)handleExtraWindowKeyboardShortcut:(NSEvent*)event {
   return [self handleExtraKeyboardShortcut:event
                                  fromTable:CommandForWindowKeyboardShortcut];
 }
 
@@ skipping 54 matching lines @@
 
 - (void)sendEvent:(NSEvent*)event {
   if (!redispatchingEvent_)
     [super sendEvent:event];
   else
     eventHandled_ = NO;
 }
 
 @end  // ChromeEventProcessingWindow