[Mac] Convert omnibox keyword hint to decoration.

chrome/browser/cocoa/location_bar/autocomplete_text_field_cell.h

 // Copyright (c) 2010 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 <vector>
 
 #import <Cocoa/Cocoa.h>
 
 #import "chrome/browser/cocoa/styled_text_field_cell.h"
 
-#include "base/scoped_nsobject.h"
-
 @class AutocompleteTextField;
 class LocationBarDecoration;
 
 // AutocompleteTextFieldCell extends StyledTextFieldCell to provide support for
 // certain decorations to be applied to the field.  These are the search hint
 // ("Type to search" on the right-hand side), the keyword hint ("Press [Tab] to
 // search Engine" on the right-hand side), and keyword mode ("Search Engine:" in
 // a button-like token on the left-hand side).
 @interface AutocompleteTextFieldCell : StyledTextFieldCell {
  @private
   // Decorations which live to the left and right of the text, ordered
   // from outside in.  Decorations are owned by |LocationBarViewMac|.
   std::vector<LocationBarDecoration*> leftDecorations_;
   std::vector<LocationBarDecoration*> rightDecorations_;
-
-  // Set if there is a string to display as a hint on the right-hand
-  // side of the field.  Exclusive WRT |keywordString_|;
-  scoped_nsobject<NSAttributedString> hintString_;
 }
 
-// Chooses |anImage| only if all pieces won't fit w/in |width|.
-// Inputs must be non-nil.
-- (void)setKeywordHintPrefix:(NSString*)prefixString
-                       image:(NSImage*)anImage
-                      suffix:(NSString*)suffixString
-              availableWidth:(CGFloat)width;
-
-// Suppresses hint entirely if |aString| won't fit w/in |width|.
-// String must be non-nil.
-- (void)setSearchHintString:(NSString*)aString
-             availableWidth:(CGFloat)width;
-- (void)clearHint;
-
 // Clear |leftDecorations_| and |rightDecorations_|.
 - (void)clearDecorations;
 
 // Add a new left-side decoration to the right of the existing
 // left-side decorations.
 - (void)addLeftDecoration:(LocationBarDecoration*)decoration;
 
 // Add a new right-side decoration to the left of the existing
 // right-side decorations.
 - (void)addRightDecoration:(LocationBarDecoration*)decoration;
@@ skipping 25 matching lines @@
 - (BOOL)mouseDown:(NSEvent*)theEvent
            inRect:(NSRect)cellFrame
            ofView:(AutocompleteTextField*)controlView;
 
 // Overridden from StyledTextFieldCell to include decorations adjacent
 // to the text area which don't handle mouse clicks themselves.
 // Keyword-search bubble, for instance.
 - (NSRect)textCursorFrameForFrame:(NSRect)cellFrame;
 
 @end
-
-// Internal methods here exposed for unit testing.
-@interface AutocompleteTextFieldCell (UnitTesting)
-
-@property(nonatomic, readonly) NSAttributedString* hintString;
-@property(nonatomic, readonly) NSAttributedString* hintIconLabel;
-
-@end