Don't set ion=1 for hidden Instant modes.

chrome/browser/search_engines/template_url_prepopulate_data.cc

Index: chrome/browser/search_engines/template_url_prepopulate_data.cc
diff --git a/chrome/browser/search_engines/template_url_prepopulate_data.cc b/chrome/browser/search_engines/template_url_prepopulate_data.cc
index 390c5fde04010b8f0be84e937a1d95061c3c8752..06fa6c6635915009d36f7a792732d0f4681cfa65 100644
--- a/chrome/browser/search_engines/template_url_prepopulate_data.cc
+++ b/chrome/browser/search_engines/template_url_prepopulate_data.cc
@@ -1109,7 +1109,7 @@ const PrepopulatedEngine google = {
       L"client=chrome&hl={language}&q={searchTerms}",
   L"{google:baseURL}webhp?{google:RLZ}sourceid=chrome-instant&"
       L"{google:instantFieldTrialGroupParameter}"
-      L"ie={inputEncoding}&ion=1{searchTerms}",
+      L"ie={inputEncoding}{google:instantEnabledParameter}{searchTerms}",
   SEARCH_ENGINE_GOOGLE,
   1,
 };
@@ -3172,7 +3172,7 @@ void RegisterUserPrefs(PrefService* prefs) {
 int GetDataVersion(PrefService* prefs) {
   // Increment this if you change the above data in ways that mean users with
   // existing data should get a new version.
-  const int kCurrentDataVersion = 37;
+  const int kCurrentDataVersion = 38;
   if (!prefs)
     return kCurrentDataVersion;
   // If a version number exist in the preferences file, it overrides the