Make UMA_HISTOGRAM_ENUMERATION work with scoped enums.

chrome/browser/chromeos/first_run/first_run_controller.cc

 // Copyright 2013 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/first_run/first_run_controller.h"
 
 #include "ash/shell.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/metrics/histogram_macros.h"
@@ skipping 79 matching lines @@
   web_contents_for_tests_ = view->GetWebContents();
 
   if (actor_->IsInitialized())
     OnActorInitialized();
 }
 
 void FirstRunController::Finalize() {
   int furthest_step = current_step_index_ == NONE_STEP_INDEX
                           ? steps_.size() - 1
                           : current_step_index_;
-  UMA_HISTOGRAM_ENUMERATION("CrosFirstRun.FurthestStep",
-                            furthest_step,
-                            steps_.size());
+  UMA_HISTOGRAM_EXACT_LINEAR("CrosFirstRun.FurthestStep", furthest_step,
+                             steps_.size());
   UMA_HISTOGRAM_MEDIUM_TIMES("CrosFirstRun.TimeSpent",
                              base::Time::Now() - start_time_);
   if (GetCurrentStep())
     GetCurrentStep()->OnBeforeHide();
   steps_.clear();
   if (actor_)
     actor_->set_delegate(NULL);
   actor_ = NULL;
   shell_helper_->RemoveObserver(this);
   shell_helper_.reset();
@@ skipping 74 matching lines @@
     current_step_index_ = NONE_STEP_INDEX;
 }
 
 first_run::Step* FirstRunController::GetCurrentStep() const {
   return current_step_index_ != NONE_STEP_INDEX ?
       steps_[current_step_index_].get() : NULL;
 }
 
 }  // namespace chromeos