Cleanup: Remove "gray text" logic from Omnibox

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

Index: chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.h
diff --git a/chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.h b/chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.h
index 6ce410c8e935e72d0b7f391efde941239bd48c93..9f4794867c0f8dd2d0294b9ddb92d6341ba992e0 100644
--- a/chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.h
+++ b/chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.h
@@ -89,8 +89,6 @@ class OmniboxViewMac : public OmniboxView,
   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;
@@ -219,8 +217,6 @@ class OmniboxViewMac : public OmniboxView,
   // Was the delete key pressed with an empty selection at the end of the edit?
   bool delete_at_end_pressed_;
 
-  base::string16 suggest_text_;
-
   // State used to coalesce changes to text and selection to avoid drawing
   // transient state.
   bool in_coalesced_update_block_;