Enable prefetch-search-results on Desktop Chrome by default.

chrome/browser/ui/omnibox/omnibox_current_page_delegate_impl.cc

Index: chrome/browser/ui/omnibox/omnibox_current_page_delegate_impl.cc
diff --git a/chrome/browser/ui/omnibox/omnibox_current_page_delegate_impl.cc b/chrome/browser/ui/omnibox/omnibox_current_page_delegate_impl.cc
index 991804331037904e46fd469ec4093de2389cc557..fd92ef6cce0228141aabafeceb7066b3175f4d51 100644
--- a/chrome/browser/ui/omnibox/omnibox_current_page_delegate_impl.cc
+++ b/chrome/browser/ui/omnibox/omnibox_current_page_delegate_impl.cc
@@ -120,18 +120,18 @@ void OmniboxCurrentPageDelegateImpl::DoPrerender(
 
 void OmniboxCurrentPageDelegateImpl::SetSuggestionToPrefetch(
       const InstantSuggestion& suggestion) {
+  DCHECK(chrome::IsInstantExtendedAPIEnabled());
   content::WebContents* web_contents = controller_->GetWebContents();
   if (web_contents &&
       SearchTabHelper::FromWebContents(web_contents)->IsSearchResultsPage()) {
-    if (chrome::ShouldPrefetchSearchResultsOnSRP() ||
-        chrome::ShouldPrefetchSearchResults()) {
+    if (chrome::ShouldPrefetchSearchResultsOnSRP()) {
       SearchTabHelper::FromWebContents(web_contents)->
           SetSuggestionToPrefetch(suggestion);
     }
-  } else if (chrome::ShouldPrefetchSearchResults()) {
-      InstantSearchPrerenderer* prerenderer =
-          InstantSearchPrerenderer::GetForProfile(profile_);
-      if (prerenderer)
-        prerenderer->Prerender(suggestion);
+  } else {
+    InstantSearchPrerenderer* prerenderer =
+        InstantSearchPrerenderer::GetForProfile(profile_);
+    if (prerenderer)
+      prerenderer->Prerender(suggestion);
   }
 }