[Mac] Expose AutocompleteEditViewMac to Cocoa code.

chrome/browser/cocoa/autocomplete_text_field_editor.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/autocomplete_text_field_editor.h"
 
 #include "app/l10n_util_mac.h"
 #include "base/string_util.h"
 #include "grit/generated_resources.h"
+#include "base/sys_string_conversions.h"
+#import "chrome/browser/cocoa/autocomplete_text_field.h"
 
 @implementation AutocompleteTextFieldEditor
 
 - (void)copy:(id)sender {
   NSPasteboard* pb = [NSPasteboard generalPasteboard];
   [self performCopy:pb];
 }
 
 - (void)cut:(id)sender {
   NSPasteboard* pb = [NSPasteboard generalPasteboard];
   [self performCut:pb];
 }
 
 - (void)performCopy:(NSPasteboard*)pb {
   [pb declareTypes:[NSArray array] owner:nil];
   [self writeSelectionToPasteboard:pb types:
       [NSArray arrayWithObject:NSStringPboardType]];
 }
 
 - (void)performCut:(NSPasteboard*)pb {
   [self performCopy:pb];
   [self delete:nil];
 }
 
-- (BOOL)shouldPaste {
-  id delegate = [self delegate];
-  if (![delegate respondsToSelector:@selector(textShouldPaste:)] ||
-      [delegate textShouldPaste:self]) {
-    return YES;
-  }
-  return NO;
+// This class assumes that the delegate is an AutocompleteTextField.
+// Enforce that assumption.
+- (void)setDelegate:(id)anObject {
+  DCHECK(anObject == nil ||
+         [anObject isKindOfClass:[AutocompleteTextField class]]);
+  [super setDelegate:anObject];
+}
+
+// Convenience method for retrieving the observer from the delegate.
+- (AutocompleteTextFieldObserver*)observer {
+  DCHECK([[self delegate] isKindOfClass:[AutocompleteTextField class]]);
+  return [static_cast<AutocompleteTextField*>([self delegate]) observer];
 }
 
 - (void)paste:(id)sender {
-  if ([self shouldPaste]) {
-    [super paste:sender];
+  AutocompleteTextFieldObserver* observer = [self observer];
+  DCHECK(observer);
+  if (observer) {
+    observer->OnPaste();
   }
 }
 
 - (void)pasteAndGo:sender {
   id delegate = [self delegate];
   if ([delegate respondsToSelector:@selector(textDidPasteAndGo:)])
     [delegate textDidPasteAndGo:self];
 }
 
 // We have rich text, but it shouldn't be modified by the user, so
@@ skipping 31 matching lines @@
     if (label) {
       [menu insertItemWithTitle:label action:@selector(pasteAndGo:)
             keyEquivalent:@"" atIndex:3];
     }
   }
 
   return menu;
 }
 
 @end