Fix 'VirtualKeyboard.InitLatency.FirstLoad' metrics to be recorded for any keyboards.

ui/keyboard/keyboard_util.cc

Index: ui/keyboard/keyboard_util.cc
diff --git a/ui/keyboard/keyboard_util.cc b/ui/keyboard/keyboard_util.cc
index c80d9f1a03c553aca883d81510a278f80f2f623c..a9c14ba8b0354f76ea04fbc6001a85dbc1566a48 100644
--- a/ui/keyboard/keyboard_util.cc
+++ b/ui/keyboard/keyboard_util.cc
@@ -369,20 +369,16 @@ bool SendKeyEvent(const std::string type,
 }
 
 void MarkKeyboardLoadStarted() {
-  if (!g_keyboard_load_time_start.Get().ToInternalValue())
+  if (g_keyboard_load_time_start.Get().is_null())
     g_keyboard_load_time_start.Get() = base::Time::Now();
 }
 
 void MarkKeyboardLoadFinished() {
   // Possible to get a load finished without a start if navigating directly to
   // chrome://keyboard.
-  if (!g_keyboard_load_time_start.Get().ToInternalValue())
+  if (g_keyboard_load_time_start.Get().is_null())
     return;
 
-  // It should not be possible to finish loading the keyboard without starting
-  // to load it first.
-  DCHECK(g_keyboard_load_time_start.Get().ToInternalValue());
-
   static bool logged = false;
   if (!logged) {
     // Log the delta only once.