Use stricter type checking in UMA_HISTOGRAM_ENUMERATION

ios/chrome/browser/physical_web/physical_web_initial_state_recorder.mm

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ios/chrome/browser/physical_web/physical_web_initial_state_recorder.h"
 
 #import <CoreBluetooth/CoreBluetooth.h>
 #import <CoreLocation/CoreLocation.h>
 
 #include "base/metrics/histogram_macros.h"
@@ skipping 147 matching lines @@
     state |= LOCATION_SERVICES_FLAG;
   }
   if (locationAuthorized) {
     state |= LOCATION_AUTHORIZED_FLAG;
   }
   if (bluetoothEnabled) {
     state |= BLUETOOTH_FLAG;
   }
 
   DCHECK(state < PHYSICAL_WEB_INITIAL_STATE_COUNT);
-  UMA_HISTOGRAM_ENUMERATION("PhysicalWeb.InitialState.IosChrome", state,
-                            PHYSICAL_WEB_INITIAL_STATE_COUNT);
+  UMA_HISTOGRAM_ENUMERATION(
+      "PhysicalWeb.InitialState.IosChrome",
+      static_cast<PhysicalWebInitialStateIosChrome>(state),
+      PHYSICAL_WEB_INITIAL_STATE_COUNT);
 }
 
 @end