Remove a variety of no-longer-used query params.

chrome/renderer/searchbox/searchbox.h

Index: chrome/renderer/searchbox/searchbox.h
diff --git a/chrome/renderer/searchbox/searchbox.h b/chrome/renderer/searchbox/searchbox.h
index 562c3e413a89c22fd712678171770d400ca772fa..fa41434457d7e63b5b834e125464b72222e23212 100644
--- a/chrome/renderer/searchbox/searchbox.h
+++ b/chrome/renderer/searchbox/searchbox.h
@@ -140,7 +140,6 @@ class SearchBox : public content::RenderViewObserver,
   bool is_key_capture_enabled() const { return is_key_capture_enabled_; }
   bool display_instant_results() const { return display_instant_results_; }
   const base::string16& query() const { return query_; }
-  int start_margin() const { return start_margin_; }
   const InstantSuggestion& suggestion() const { return suggestion_; }
 
  private:
@@ -154,7 +153,6 @@ class SearchBox : public content::RenderViewObserver,
   void OnFocusChanged(OmniboxFocusState new_focus_state,
                       OmniboxFocusChangeReason reason);
   void OnHistorySyncCheckResult(bool sync_history);
-  void OnMarginChange(int margin);
   void OnMostVisitedChanged(
       const std::vector<InstantMostVisitedItem>& items);
   void OnPromoInformationReceived(bool is_app_launcher_enabled);
@@ -184,7 +182,6 @@ class SearchBox : public content::RenderViewObserver,
   ThemeBackgroundInfo theme_info_;
   base::string16 query_;
   EmbeddedSearchRequestParams embedded_search_request_params_;
-  int start_margin_;
   InstantSuggestion suggestion_;
 
   DISALLOW_COPY_AND_ASSIGN(SearchBox);