Chromium doesn't compile with -Wglobal-constructors

chrome/browser/page_load_metrics/user_input_tracker.h

Index: chrome/browser/page_load_metrics/user_input_tracker.h
diff --git a/chrome/browser/page_load_metrics/user_input_tracker.h b/chrome/browser/page_load_metrics/user_input_tracker.h
index 5e3ce4d090ccc17d52b6311de163bc61e1d51f5d..bb3f3ee03c251758d2d50cf3f2c40ed04162822e 100644
--- a/chrome/browser/page_load_metrics/user_input_tracker.h
+++ b/chrome/browser/page_load_metrics/user_input_tracker.h
@@ -37,7 +37,7 @@ namespace page_load_metrics {
 class UserInputTracker {
  public:
   // Only public for tests.
-  static const size_t kMaxTrackedEvents;
+  static constexpr size_t kMaxTrackedEvents = 100;
   static base::TimeTicks GetEventTime(const blink::WebInputEvent& event);
 
   // Given a time, round to the nearest rate-limited offset. UserInputTracker