[Mac] Prevent the field from updating the font panel and any ruler state.

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 "base/string_util.h"
 #include "base/sys_string_conversions.h"
 
 @implementation AutocompleteTextFieldEditor
@@ skipping 27 matching lines @@
   }
   return NO;
 }
 
 - (void)paste:(id)sender {
   if ([self shouldPaste]) {
     [super paste:sender];
   }
 }
 
+// We have rich text, but it shouldn't be modified by the user, so
+// don't update the font panel.  In theory, -setUsesFontPanel: should
+// accomplish this, but that gets called frequently with YES when
+// NSTextField and NSTextView synchronize their contents.  That is
+// probably unavoidable because in most cases having rich text in the
+// field you probably would expect it to update the font panel.
+- (void)updateFontPanel {
+}
+
+// No ruler bar, so don't update any of that state, either.
+- (void)updateRuler {
+}
+
 @end