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

chrome/browser/search/search.cc

Index: chrome/browser/search/search.cc
diff --git a/chrome/browser/search/search.cc b/chrome/browser/search/search.cc
index d473454fd0b7e1adbbf0fc12e4d97ddd9d19634c..a3179d4cc03a5454b4fa2c7947e29659f5874b7f 100644
--- a/chrome/browser/search/search.cc
+++ b/chrome/browser/search/search.cc
@@ -65,15 +65,18 @@ const uint64 kEmbeddedPageVersionDefault = 2;
 #endif
 
 const char kHideVerbatimFlagName[] = "hide_verbatim";
-const char kPrefetchSearchResultsFlagName[] = "prefetch_results";
 const char kPrefetchSearchResultsOnSRP[] = "prefetch_results_srp";
 const char kAllowPrefetchNonDefaultMatch[] = "allow_prefetch_non_default_match";
 const char kPrerenderInstantUrlOnOmniboxFocus[] =
     "prerender_instant_url_on_omnibox_focus";
 
+#if defined(OS_ANDROID)
+const char kPrefetchSearchResultsFlagName[] = "prefetch_results";
+
 // Controls whether to reuse prerendered Instant Search base page to commit any
 // search query.
 const char kReuseInstantSearchBasePage[] = "reuse_instant_search_base_page";
+#endif
 
 // Controls whether to use the alternate Instant search base URL. This allows
 // experimentation of Instant search.
@@ -596,6 +599,7 @@ bool ShouldPrefetchSearchResults() {
   if (!IsInstantExtendedAPIEnabled())
     return false;
 
+#if defined(OS_ANDROID)
   if (CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kPrefetchSearchResults)) {
     return true;
@@ -604,6 +608,8 @@ bool ShouldPrefetchSearchResults() {
   FieldTrialFlags flags;
   return GetFieldTrialInfo(&flags) && GetBoolValueForFlagWithDefault(
       kPrefetchSearchResultsFlagName, false, flags);
+#endif
+  return true;

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

nit: It would be slightly clearer to write #else ... #endif around this return

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

Done.

 }
 
 bool ShouldAllowPrefetchNonDefaultMatch() {
@@ -628,9 +634,12 @@ bool ShouldReuseInstantSearchBasePage() {
   if (!ShouldPrefetchSearchResults())
     return false;
 
+#if defined(OS_ANDROID)
   FieldTrialFlags flags;
   return GetFieldTrialInfo(&flags) && GetBoolValueForFlagWithDefault(
       kReuseInstantSearchBasePage, false, flags);
+#endif
+  return true;
 }
 
 GURL GetLocalInstantURL(Profile* profile) {