Unlaunch the HIDDEN mode.

chrome/browser/autocomplete/autocomplete.cc

Index: chrome/browser/autocomplete/autocomplete.cc
diff --git a/chrome/browser/autocomplete/autocomplete.cc b/chrome/browser/autocomplete/autocomplete.cc
index 9efc10839015168ad0e169f2e087bf04f7687357..170bcf118c176c47fa9667310293986d9390fdd2 100644
--- a/chrome/browser/autocomplete/autocomplete.cc
+++ b/chrome/browser/autocomplete/autocomplete.cc
@@ -932,7 +932,7 @@ void AutocompleteController::Start(
       (text.length() < 6)) {
     base::TimeTicks end_time = base::TimeTicks::Now();
     std::string name = "Omnibox.QueryTime." + base::IntToString(text.length()) +
-        InstantFieldTrial::GetGroupName(profile_);
+        InstantFieldTrial::GetModeAsString(profile_);
     base::Histogram* counter = base::Histogram::FactoryGet(
         name, 1, 1000, 50, base::Histogram::kUmaTargetedHistogramFlag);
     counter->Add(static_cast<int>((end_time - start_time).InMilliseconds()));