[Mac] Refactor location-bar autocomplete cell classes.

chrome/browser/cocoa/autocomplete_text_field.mm

Index: chrome/browser/cocoa/autocomplete_text_field.mm
diff --git a/chrome/browser/cocoa/autocomplete_text_field.mm b/chrome/browser/cocoa/autocomplete_text_field.mm
new file mode 100644
index 0000000000000000000000000000000000000000..0efb310ac1946f4a5477bdf2facff17267c91810
--- /dev/null
+++ b/chrome/browser/cocoa/autocomplete_text_field.mm
@@ -0,0 +1,20 @@
+// 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.
+
+#include "chrome/browser/cocoa/autocomplete_text_field.h"
+
+#include "base/logging.h"
+#include "chrome/browser/cocoa/autocomplete_text_field_cell.h"
+
+@implementation AutocompleteTextField
+
++ (Class)cellClass {
+  return [AutocompleteTextFieldCell class];
+}
+
+- (void)awakeFromNib {
+  DCHECK([[self cell] isKindOfClass:[AutocompleteTextFieldCell class]]);
+}
+
+@end