[Mac] Expose AutocompleteEditViewMac to Cocoa code.

chrome/browser/cocoa/autocomplete_text_field_editor.h

 // 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 <Cocoa/Cocoa.h>
 
+class AutocompleteTextFieldObserver;
+
 // AutocompleteTextFieldEditor customized the AutocompletTextField
 // field editor (helper text-view used in editing).  It intercepts UI
 // events for forwarding to the core Omnibox code.  It also undoes
 // some of the effects of using styled text in the Omnibox (the text
 // is styled but should not appear that way when copied to the
 // pasteboard).
 
-// AutocompleteTextFieldEditorDelegateMethods are meant to be similar
-// to NSTextView delegate methods, adding additional intercepts
-// relevant to the Omnibox implementation.
+// TODO(shess): Move delegate stuff to AutocompleteTextFieldObserver.
 
 @protocol AutocompleteTextFieldEditorDelegateMethods
 
-// Delegate -paste: implementation to the field being edited.  If the
-// delegate returns YES, or does not implement the method, NSTextView
-// is called to handle the paste.  The delegate can block the paste
-// (or handle it internally) by returning NO.
-- (BOOL)textShouldPaste:(NSText*)fieldEditor;
-
 // Returns nil if paste actions are not supported.
 - (NSString*)textPasteActionString:(NSText*)fieldEditor;
 - (void)textDidPasteAndGo:(NSText*)fieldEditor;
 @end
 
 // Field editor used for the autocomplete field.
 @interface AutocompleteTextFieldEditor : NSTextView {
 }
 
 // Copy contents of the TextView to the designated clipboard as plain
 // text.
 - (void)performCopy:(NSPasteboard*)pb;
 
 // Same as above, note that this calls through to performCopy.
 - (void)performCut:(NSPasteboard*)pb;
 
-// Called by -paste: to decide whether to forward to superclass.
-// Exposed for unit testing.
-- (BOOL)shouldPaste;
+@end
 
+@interface AutocompleteTextFieldEditor(PrivateTestMethods)
+- (AutocompleteTextFieldObserver*)observer;
 @end