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

chrome/browser/dom_ui/new_tab_ui.cc

 // 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/dom_ui/new_tab_ui.h"
 
 #include "base/histogram.h"
 #include "base/string_piece.h"
 #include "chrome/browser/bookmarks/bookmark_utils.h"
 #include "chrome/browser/browser.h"
@@ skipping 72 matching lines @@
   void Timeout() {
     base::TimeTicks now = base::TimeTicks::Now();
     if ((now - last_paint_) >= base::TimeDelta::FromMilliseconds(kTimeoutMs)) {
       // Painting has quieted down.  Log this as the full time to run.
       base::TimeDelta load_time = last_paint_ - start_;
       int load_time_ms = static_cast<int>(load_time.InMilliseconds());
       NotificationService::current()->Notify(
           NotificationType::INITIAL_NEW_TAB_UI_LOAD,
           NotificationService::AllSources(),
           Details<int>(&load_time_ms));
-      UMA_HISTOGRAM_TIMES(L"NewTabUI load", load_time);
+      UMA_HISTOGRAM_TIMES("NewTabUI load", load_time);
     } else {
       // Not enough quiet time has elapsed.
       // Some more paints must've occurred since we set the timeout.
       // Wait some more.
       MessageLoop::current()->PostDelayedTask(FROM_HERE,
           method_factory_.NewRunnableMethod(&PaintTimer::Timeout), kTimeoutMs);
     }
   }
 
  private:
@@ skipping 369 matching lines @@
     DictionaryValue* entry_value = new DictionaryValue;
     entry_value->SetString(L"short_name", urls[i]->short_name());
     entry_value->SetString(L"keyword", urls[i]->keyword());
 
     const GURL& url = urls[i]->GetFavIconURL();
     if (url.is_valid())
      entry_value->SetString(L"favIconURL", UTF8ToWide(url.spec()));
 
     urls_value.Append(entry_value);
   }
-  UMA_HISTOGRAM_COUNTS(L"NewTabPage.SearchURLs.Total", urls_value.GetSize());
+  UMA_HISTOGRAM_COUNTS("NewTabPage.SearchURLs.Total", urls_value.GetSize());
   dom_ui_host_->CallJavascriptFunction(L"searchURLs", urls_value);
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 // RecentlyBookmarkedHandler
 
 RecentlyBookmarkedHandler::RecentlyBookmarkedHandler(DOMUIHost* dom_ui_host)
     : dom_ui_host_(dom_ui_host),
       model_(NULL) {
   dom_ui_host->RegisterMessageCallback("getRecentlyBookmarked",
@@ skipping 388 matching lines @@
 void NewTabUIContents::RequestOpenURL(const GURL& url,
                                       const GURL& /*referrer*/,
                                       WindowOpenDisposition disposition) {
   // The user opened a URL on the page (including "open in new window").
   // We count all such clicks as AUTO_BOOKMARK, which increments the site's
   // visit count (which is used for ranking the most visited entries).
   // Note this means we're including clicks on not only most visited thumbnails,
   // but also clicks on recently bookmarked.
   OpenURL(url, GURL(), disposition, PageTransition::AUTO_BOOKMARK);
 }