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diff --git a/chrome/browser/ui/cocoa/styled_text_field.h b/chrome/browser/ui/cocoa/styled_text_field.h
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+++ b/chrome/browser/ui/cocoa/styled_text_field.h
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+// 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 StyledTextFieldCell;
+
+// An implementation of NSTextField that is designed to work with
+// StyledTextFieldCell.  Provides methods to redraw the field when cell
+// decorations have changed and overrides |mouseDown:| to properly handle clicks
+// in sections of the cell with decorations.
+@interface StyledTextField : NSTextField {
+}
+
+// Repositions and redraws the field editor.  Call this method when the cell's
+// text frame has changed (whenever changing cell decorations).
+- (void)resetFieldEditorFrameIfNeeded;
+
+// Returns the amount of the field's width which is not being taken up
+// by the text contents.  May be negative if the contents are large
+// enough to scroll.
+- (CGFloat)availableDecorationWidth;
+
+@end
+
+@interface StyledTextField (ExposedForTesting)
+- (StyledTextFieldCell*)styledTextFieldCell;
+@end