Remove search::GetSearchTerms since it always returns empty string

chrome/common/search/search_types.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_COMMON_SEARCH_SEARCH_TYPES_H_
 #define CHROME_COMMON_SEARCH_SEARCH_TYPES_H_
 
 // The Mode structure encodes the visual states encountered when interacting
 // with the NTP and the Omnibox.
 struct SearchMode {
   // The visual state that applies to the current interaction.
   enum Type {
     // The default state means anything but the following states.
     MODE_DEFAULT,
 
     // On the NTP page and the NTP is ready to be displayed.
     MODE_NTP,
 
     // The Omnibox is modified in some way, either on the NTP or not.
     MODE_SEARCH_SUGGESTIONS,
 
     // On a search results page.
+    // TODO(treib): Remove this; it's not used anymore. crbug.com/627747
     MODE_SEARCH_RESULTS,
   };
 
   // The kind of page from which the user initiated the current search.
   enum Origin {
     // The user is searching from some random page.
     ORIGIN_DEFAULT = 0,
 
     // The user is searching from the NTP.
     ORIGIN_NTP,
 
     // The user is searching from a search results page.
+    // TODO(treib): Remove this; it's not used anymore. crbug.com/627747
     ORIGIN_SEARCH,
   };
 
   SearchMode() : mode(MODE_DEFAULT), origin(ORIGIN_DEFAULT) {
   }
 
   SearchMode(Type in_mode, Origin in_origin)
       : mode(in_mode),
         origin(in_origin) {
   }
@@ skipping 36 matching lines @@
 
   bool is_origin_ntp() const {
     return origin == ORIGIN_NTP;
   }
 
   Type mode;
   Origin origin;
 };
 
 #endif  // CHROME_COMMON_SEARCH_SEARCH_TYPES_H_