Cleanup: Remove "gray text" logic from Omnibox

chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_BROWSER_UI_COCOA_OMNIBOX_OMNIBOX_VIEW_MAC_H_
 #define CHROME_BROWSER_UI_COCOA_OMNIBOX_OMNIBOX_VIEW_MAC_H_
 
 #import <Cocoa/Cocoa.h>
 #include <stddef.h>
 
@@ skipping 71 matching lines @@
                                    bool save_original_selection,
                                    bool notify_text_changed) override;
   bool OnInlineAutocompleteTextMaybeChanged(const base::string16& display_text,
                                             size_t user_text_length) override;
   void OnInlineAutocompleteTextCleared() override;
   void OnRevertTemporaryText() override;
   void OnBeforePossibleChange() override;
   bool OnAfterPossibleChange(bool allow_keyword_ui_change) override;
   gfx::NativeView GetNativeView() const override;
   gfx::NativeView GetRelativeWindowForPopup() const override;
-  void SetGrayTextAutocompletion(const base::string16& input) override;
-  base::string16 GetGrayTextAutocompletion() const override;
   int GetTextWidth() const override;
   int GetWidth() const override;
   bool IsImeComposing() const override;
 
   // Implement the AutocompleteTextFieldObserver interface.
   NSRange SelectionRangeForProposedRange(NSRange proposed_range) override;
   void OnControlKeyChanged(bool pressed) override;
   bool CanCopy() override;
   base::scoped_nsobject<NSPasteboardItem> CreatePasteboardItem() override;
   void CopyToPasteboard(NSPasteboard* pboard) override;
@@ skipping 129 matching lines @@
   // painted. Used to measure omnibox responsiveness with a histogram.
   base::TimeTicks insert_char_time_;
 
   // The time when OnBeforeDrawRect() was called.
   base::TimeTicks draw_rect_start_time_;
 
   DISALLOW_COPY_AND_ASSIGN(OmniboxViewMac);
 };
 
 #endif  // CHROME_BROWSER_UI_COCOA_OMNIBOX_OMNIBOX_VIEW_MAC_H_