Revert of Remove setVoiceSearchSupported part of EmbeddedSearch SearchBox API.

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 6c5bea98d2a25af137a3f4d9d5ec3167fa5ff33f..0db812788c6fb8edd5478b05ac99fc4ffd33b2c2 100644
--- a/chrome/browser/ui/search/search_tab_helper.h
+++ b/chrome/browser/ui/search/search_tab_helper.h
@@ -90,6 +90,9 @@
   // Called when the tab corresponding to |this| instance is deactivated.
   void OnTabDeactivated();
 
+  // Tells the page to toggle voice search.
+  void ToggleVoiceSearch();
+
   // Returns true if the underlying page is a search results page.
   bool IsSearchResultsPage();
 
@@ -155,6 +158,7 @@
 
   // Overridden from SearchIPCRouter::Delegate:
   void OnInstantSupportDetermined(bool supports_instant) override;
+  void OnSetVoiceSearchSupport(bool supports_voice_search) override;
   void FocusOmnibox(OmniboxFocusState state) override;
   void NavigateToURL(const GURL& url,
                      WindowOpenDisposition disposition,