Use string for Histogram names since these are all ASCII anyway wide-characte...

chrome/browser/renderer_host/render_widget_host_view_mac.mm

 // Copyright (c) 2006-2008 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/renderer_host/render_widget_host_view_mac.h"
 
 #include "base/histogram.h"
 #include "base/sys_string_conversions.h"
 #include "chrome/browser/browser_trial.h"
 #include "chrome/browser/renderer_host/backing_store.h"
@@ skipping 293 matching lines @@
     }
     if (!renderWidgetHostView_->whiteout_start_time().is_null()) {
       base::TimeDelta whiteout_duration = base::TimeTicks::Now() -
           renderWidgetHostView_->whiteout_start_time();
 
       // If field trial is active, report results in special histogram.
       static scoped_refptr<FieldTrial> trial(
           FieldTrialList::Find(BrowserTrial::kMemoryModelFieldTrial));
       if (trial.get()) {
         if (trial->boolean_value())
-          UMA_HISTOGRAM_TIMES(L"MPArch.RWHH_WhiteoutDuration_trial_high_memory",
+          UMA_HISTOGRAM_TIMES("MPArch.RWHH_WhiteoutDuration_trial_high_memory",
                               whiteout_duration);
         else
-          UMA_HISTOGRAM_TIMES(L"MPArch.RWHH_WhiteoutDuration_trial_med_memory",
+          UMA_HISTOGRAM_TIMES("MPArch.RWHH_WhiteoutDuration_trial_med_memory",
                               whiteout_duration);
       } else {
-        UMA_HISTOGRAM_TIMES(L"MPArch.RWHH_WhiteoutDuration", whiteout_duration);
+        UMA_HISTOGRAM_TIMES("MPArch.RWHH_WhiteoutDuration", whiteout_duration);
       }
 
       // Reset the start time to 0 so that we start recording again the next
       // time the backing store is NULL...
       renderWidgetHostView_->whiteout_start_time() = base::TimeTicks();
     }
   } else {
     [[NSColor whiteColor] set];
     NSRectFill(dirtyRect);
     if (renderWidgetHostView_->whiteout_start_time().is_null())
@@ skipping 15 matching lines @@
   return YES;
 }
 
 - (BOOL)resignFirstResponder {
   renderWidgetHostView_->render_widget_host()->Blur();
   
   return YES;
 }
 
 @end