Use stricter type checking in UMA_HISTOGRAM_ENUMERATION

chrome/browser/chromeos/policy/upload_job_impl.cc

 // Copyright (c) 2015 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.
 
 #include "chrome/browser/chromeos/policy/upload_job_impl.h"
 
 #include <stddef.h>
 #include <set>
 #include <utility>
 
@@ skipping 391 matching lines @@
     SYSLOG(ERROR) << "URLRequestStatus error " << status.error();
     HandleError(NETWORK_ERROR);
   } else {
     const int response_code = source->GetResponseCode();
     if (response_code == net::HTTP_OK) {
       // Successful upload
       upload_fetcher_.reset();
       access_token_.clear();
       post_data_.reset();
       state_ = SUCCESS;
-      UMA_HISTOGRAM_ENUMERATION(kUploadJobSuccessHistogram, retry_,
-                                UploadJobSuccess::REQUEST_MAX);
+      UMA_HISTOGRAM_EXACT_LINEAR(
+          kUploadJobSuccessHistogram, retry_,
+          static_cast<int>(UploadJobSuccess::REQUEST_MAX));
       delegate_->OnSuccess();
     } else if (response_code == net::HTTP_UNAUTHORIZED) {
       SYSLOG(ERROR) << "Unauthorized request.";
       HandleError(AUTHENTICATION_ERROR);
     } else {
       SYSLOG(ERROR) << "POST request failed with HTTP status code "
                     << response_code << ".";
       HandleError(SERVER_ERROR);
     }
   }
 }
 
 }  // namespace policy