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..64d0fd0e442013d6f98395a19561a45f81a3ae11 100644
--- a/chrome/browser/ui/omnibox/omnibox_current_page_delegate_impl.cc
+++ b/chrome/browser/ui/omnibox/omnibox_current_page_delegate_impl.cc
@@ -123,15 +123,14 @@ void OmniboxCurrentPageDelegateImpl::SetSuggestionToPrefetch(
   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 {

[Jered, 2014/07/14 16:18:27]

Technically, don't you still need to call ShouldPrefetchSearchResults() here? It
only returns true if InstantExtendedAPI is enabled, not always.

[kmadhusu, 2014/07/14 19:37:15]

This function is called only when InstantExtendedAPI is enabled. We have that
check in OmniboxController::OnResultChanged(). Can I add a DCHECK() here instead
of a if condition? 

[Jered, 2014/07/14 23:23:56]

Sure, that's fine.

+    InstantSearchPrerenderer* prerenderer =
+        InstantSearchPrerenderer::GetForProfile(profile_);
+    if (prerenderer)
+      prerenderer->Prerender(suggestion);
   }
 }