[Mac] Make I-beam cursor match editing area.

chrome/browser/cocoa/autocomplete_text_field_cell.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>
 
 #include "base/scoped_nsobject.h"
 
 // AutocompleteTextFieldCell customizes the look of the Omnibox text
 // field.  The border and focus ring are modified, as is the font
@@ skipping 38 matching lines @@
 // The following setup |keywordString_| or |hintString_| based on the
 // input, and set |fieldEditorNeedsReset_| if the layout of the field
 // changed.
 - (void)setKeywordString:(NSString*)aString;
 - (void)setKeywordHintPrefix:(NSString*)prefixString
                        image:(NSImage*)anImage
                       suffix:(NSString*)suffixString;
 - (void)setSearchHintString:(NSString*)aString;
 - (void)clearKeywordAndHint;
 
+// Return the portion of the cell to show the text cursor over.
+- (NSRect)textCursorFrameForFrame:(NSRect)cellFrame;
+
 // Return the portion of the cell to use for text display.
 - (NSRect)textFrameForFrame:(NSRect)cellFrame;
 
 @end
 
 // Internal methods here exposed for unit testing.
 @interface AutocompleteTextFieldCell (UnitTesting)
 
 @property(readonly) NSAttributedString* keywordString;
 @property(readonly) NSAttributedString* hintString;
 
 @end