Implement SearchTabHelperDelegate.

chrome/browser/ui/search/search_tab_helper.h

Index: chrome/browser/ui/search/search_tab_helper.h
diff --git a/chrome/browser/ui/search/search_tab_helper.h b/chrome/browser/ui/search/search_tab_helper.h
index 00ee8afba4c9a424e77a0369359ebbe0795f4879..e0fc102cc647ede53ce17ab4df4458276cdd14aa 100644
--- a/chrome/browser/ui/search/search_tab_helper.h
+++ b/chrome/browser/ui/search/search_tab_helper.h
@@ -30,6 +30,7 @@ class InstantPageTest;
 class InstantService;
 class Profile;
 class SearchIPCRouterTest;
+class SearchTabHelperDelegate;
 
 // Per-tab search "helper".  Acts as the owner and controller of the tab's
 // search UI model.
@@ -92,6 +93,8 @@ class SearchTabHelper : public content::WebContentsObserver,
   // Returns true if the underlying page is a search results page.
   bool IsSearchResultsPage();
 
+  void set_delegate(SearchTabHelperDelegate* delegate) { delegate_ = delegate; }
+
  private:
   friend class content::WebContentsUserData<SearchTabHelper>;
   friend class InstantPageTest;
@@ -181,11 +184,6 @@ class SearchTabHelper : public content::WebContentsObserver,
       const std::vector<InstantMostVisitedItem>& items) OVERRIDE;
   virtual void OmniboxStartMarginChanged(int omnibox_start_margin) OVERRIDE;
 
-  // Removes recommended URLs if a matching URL is already open in the Browser,
-  // if the Most Visited Tile Placement experiment is enabled, and the client is
-  // in the experiment group.
-  void MaybeRemoveMostVisitedItems(std::vector<InstantMostVisitedItem>* items);
-
   // Sets the mode of the model based on the current URL of web_contents().
   // Only updates the origin part of the mode if |update_origin| is true,
   // otherwise keeps the current origin. If |is_preloaded_ntp| is true, the mode
@@ -222,6 +220,11 @@ class SearchTabHelper : public content::WebContentsObserver,
 
   InstantService* instant_service_;
 
+  // Delegate for notifying our owner about the SearchTabHelper state. Not owned
+  // by us.
+  // NULL on iOS and Android because they don't use the Instant framework.
+  SearchTabHelperDelegate* delegate_;
+
   DISALLOW_COPY_AND_ASSIGN(SearchTabHelper);
 };