Hide content suggestion summaries by default.

chrome/browser/android/chrome_feature_list.cc

Index: chrome/browser/android/chrome_feature_list.cc
diff --git a/chrome/browser/android/chrome_feature_list.cc b/chrome/browser/android/chrome_feature_list.cc
index dbc9cb16d537be7473422903af99295768b25813..1847712c520ab53f252ac890df31727b78c2f76b 100644
--- a/chrome/browser/android/chrome_feature_list.cc
+++ b/chrome/browser/android/chrome_feature_list.cc
@@ -149,7 +149,7 @@ const base::Feature kContentSuggestionsSettings{
     "ContentSuggestionsSettings", base::FEATURE_DISABLED_BY_DEFAULT};
 
 const base::Feature kContentSuggestionsShowSummary{
-    "ContentSuggestionsShowSummary", base::FEATURE_ENABLED_BY_DEFAULT};
+    "ContentSuggestionsShowSummary", base::FEATURE_DISABLED_BY_DEFAULT};
 
 const base::Feature kContextualSearchSingleActions{
     "ContextualSearchSingleActions", base::FEATURE_ENABLED_BY_DEFAULT};