[TTS] Update Contextual Cards response decoding for v1.

chrome/browser/android/contextualsearch/contextual_search_delegate.h

Index: chrome/browser/android/contextualsearch/contextual_search_delegate.h
diff --git a/chrome/browser/android/contextualsearch/contextual_search_delegate.h b/chrome/browser/android/contextualsearch/contextual_search_delegate.h
index 4766041076f5f9971067e06185020be2e7aeb252..ae5946d4bdd1034fe5593ccc6d0ac8c1e0e2203b 100644
--- a/chrome/browser/android/contextualsearch/contextual_search_delegate.h
+++ b/chrome/browser/android/contextualsearch/contextual_search_delegate.h
@@ -202,12 +202,6 @@ class ContextualSearchDelegate
                                int* startResult,
                                int* endResult);
 
-  // Decodes the Contextual Cards (Now on Tap) response from the given
-  // dictionary, and sets the subtitle and/or thumbnail if they are present.
-  void DecodeContextualCardsResponse(const base::DictionaryValue& dict,
-                                     std::string* subtitle,
-                                     std::string* thumbnail);
-
   // Generates a subset of the given surrounding_text string, for Icing
   // integration.
   // |surrounding_text| the entire text context that contains the selection.