Change logging of about:flags from actions to a histogram.

chrome/browser/metrics/chrome_browser_main_extra_parts_metrics.cc

Index: chrome/browser/metrics/chrome_browser_main_extra_parts_metrics.cc
diff --git a/chrome/browser/metrics/chrome_browser_main_extra_parts_metrics.cc b/chrome/browser/metrics/chrome_browser_main_extra_parts_metrics.cc
index b1af95d46c49e1f16df919098bf4be74ca4560cc..51bff81ed118e643f072c7a041dfb1109107da77 100644
--- a/chrome/browser/metrics/chrome_browser_main_extra_parts_metrics.cc
+++ b/chrome/browser/metrics/chrome_browser_main_extra_parts_metrics.cc
@@ -319,9 +319,9 @@ void ChromeBrowserMainExtraPartsMetrics::PreProfileInit() {
 }
 
 void ChromeBrowserMainExtraPartsMetrics::PreBrowserStart() {
-  flags_ui::PrefServiceFlagsStorage flags_storage_(
+  flags_ui::PrefServiceFlagsStorage flags_storage(
       g_browser_process->local_state());
-  about_flags::RecordUMAStatistics(&flags_storage_);
+  about_flags::RecordUMAStatistics(&flags_storage);
 }
 
 void ChromeBrowserMainExtraPartsMetrics::PostBrowserStart() {