[Mac] Convert omnibox keyword hint to decoration.

chrome/browser/cocoa/location_bar/autocomplete_text_field_cell.h

Index: chrome/browser/cocoa/location_bar/autocomplete_text_field_cell.h
diff --git a/chrome/browser/cocoa/location_bar/autocomplete_text_field_cell.h b/chrome/browser/cocoa/location_bar/autocomplete_text_field_cell.h
index d1150e2f5db1926c4431358d2ce1a5e505ce0509..ddf71c93309a60ab8adce89ab8aaea57c33abf17 100644
--- a/chrome/browser/cocoa/location_bar/autocomplete_text_field_cell.h
+++ b/chrome/browser/cocoa/location_bar/autocomplete_text_field_cell.h
@@ -8,8 +8,6 @@
 
 #import "chrome/browser/cocoa/styled_text_field_cell.h"
 
-#include "base/scoped_nsobject.h"
-
 @class AutocompleteTextField;
 class LocationBarDecoration;
 
@@ -24,25 +22,8 @@ class LocationBarDecoration;
   // 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;
 
@@ -88,11 +69,3 @@ class LocationBarDecoration;
 - (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