Make EmitNtpStatistics() private.

chrome/browser/ui/search/instant_controller.cc

Index: chrome/browser/ui/search/instant_controller.cc
diff --git a/chrome/browser/ui/search/instant_controller.cc b/chrome/browser/ui/search/instant_controller.cc
index 33ed4b3b9b806cc7e9936a511c544c949c79399e..d1f628f8ce72dd1fa1e586082dbd0c4b3983ea73 100644
--- a/chrome/browser/ui/search/instant_controller.cc
+++ b/chrome/browser/ui/search/instant_controller.cc
@@ -108,10 +108,9 @@ void InstantController::ActiveTabChanged() {
 }
 
 void InstantController::TabDeactivated(content::WebContents* contents) {
-  // If user is deactivating an NTP tab, log the number of mouseovers for this
-  // NTP session.
+  // If user is deactivating an NTP tab, give it a change to log stats.
   if (search::IsInstantNTP(contents))
-    InstantTab::EmitNtpStatistics(contents);
+    InstantTab::TabDeactivated(contents);
 }
 
 void InstantController::LogDebugEvent(const std::string& info) const {